Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a0266a78b2d25ca…

MALICIOUS

PDF

88.0 KB Created: 2021-08-04 20:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a782463eb7c28b8e48ce8a4ecad1a8b SHA-1: f2104e8e82adf4a207caa2caf558e4e0d25f8e0e SHA-256: 0a0266a78b2d25ca9406faf533858db515578556790d695606b0605095a8d810
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it is a link farm and a callback phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the presence of embedded URLs and the callback lure pattern point towards social engineering to trick users into contacting malicious actors. The document body is heavily obfuscated, preventing direct analysis of its content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://nguyenquangcomputer.com/upload/ck/files/30609392099.pdf In PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076f6dcf39c0---87019434798.pdfIn PDF document text
    • https://empresa-venta.hr/files/kusikepodiluvukopopakufok.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/ripevidipam.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161029ec46d7eb---sugogojawiv.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/prfk76nrkf5if82f1dkumker12/82029256851.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1821a33cfe860c9469a1cb41883c494d/bofibonagen.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c42414ad3f---98071742011.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/25170511700.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/mokapikibid.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a979b9ed8e9---wuxoliw.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/60271918440.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/3f6cae0d7364ff91489c9d665aaddf5d/39512990998.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ee3f3b21c17b82c7fdd3cd59bb111f44/6911024094.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41e9aa20c6---kibazigeri.pdfIn PDF document text
    • http://ahchala.com/img/file/sojonulu.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758b407ae2a---zubetabafi.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/e4e5238f06ba953a611f916232ba6201/30856626338.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/83343926021.pdfIn PDF document text
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/99724466065.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/timudemosuk.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2666cb0d61---pisijetadiziretuwop.pdfIn PDF document text
    • http://www.puhito.hu/uploads/nenubufakubolepijerebava.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca972287933---19323292891.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38e0a99d94---27919456067.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d14990b90---zawuloteguwedukodo.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dcc5f267c---25157819837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=oxford+medical+dictionary+english+to+banglaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 11304 bytes
SHA-256: b303db3ef034fb7477de43277f959a131621aa19363d3c89ffb69f8e83ca0a60
font_01_sfnt_off00010be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE0 17204 bytes
SHA-256: 657d0fad56c4064465d1480918811f23bca7bcc26057a0b971a665e7bcf4241a
font_02_sfnt_off00013918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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