Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc4f8d520170a03…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 09:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 24f169f3c3bed92416df85f5d0d0a149 SHA-1: cd5164caa68f2d6455e502975a29c0f74402216e SHA-256: 4dc4f8d520170a03a335e7faff4585fbeee3047d9b22825bf8f4e80c5ddacc0a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick the user into calling a phone number, likely for a tech-support scam or refund fraud. While no scripts were directly extracted, the presence of numerous links to potentially compromised WordPress sites and other domains suggests a broader infrastructure for hosting malicious content or redirecting users. The document's structure and embedded links point towards an attempt to exploit user trust for financial gain or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chira-med.pl/pliki/88659267786.pdf In PDF document text
    • http://abwmarlboropike.com/uploads/files/93059201189.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/wolisaxep.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/texinaluvitu.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/67079790211.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23002353cc---89643938241.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1ik817sqaos7ca8e03gu55n497/gujofadotuzezoxasasuz.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/wakimolojepozezamekazagu.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ddb2842b1---61120884642.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/jln5hu8bp9pkdr1um2fsi0lgk2/sozezomalobowivemunisumi.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/17845696978.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3125c0c1aa---50004756383.pdfIn PDF document text
    • http://furniture83.com/upload/files/fipiwulojokaj.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/fobekufelup.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/63119395870.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e30f665809---52936704870.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/69be0fd81731cd087cf8d081358c74c1/85394086508.pdfIn PDF document text
    • http://rfamilylucas.com/clients/73238/File/rupapemitopixotuxesozirut.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/42474516845.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///kigonugitonavukutesejiw.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cf367dd66---jepunujadopexudog.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/24162889795.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4df64f068---9817105858.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/9671bfb6b23e24b3ff2a1a9e5b71c832/dosajediguwogazatenog.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/8841d8cd0b314edca4defb8e2b31321d/tavolasoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=electrocardiogram+interpretation+pdfPDF 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_off0000d949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD949 16820 bytes
SHA-256: 1bed820190bddcec2e4311cb38f81c55044a6c901e77b000523b858dc87b812e
font_01_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 10776 bytes
SHA-256: 8543ac45209e790d367686a69db93b6536545a072046b0394a59c3ec638d8491
font_02_sfnt_off00011ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.