Malicious PDF — malware analysis report

Static analysis result for SHA-256 f723c41b8f8e9616…

MALICIOUS

PDF

97.0 KB Created: 2021-09-06 21:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f8a77f8dda06b9880ad48065f4159223 SHA-1: f5f3d92d74a4f97a2fd8cbc1b0eac87f61123337 SHA-256: f723c41b8f8e9616ed871b7df526c6e9a500e023797e71d28c9e81d4747b6d4d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing and callback lure. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The heuristic 'SE_CALLBACK_LURE' specifically indicates the document's intent to trick users into calling a phone number, a common tactic in tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sanarina.de/ckfinder/userfiles/files/94708488164.pdf In PDF document text
    • http://dep14kirov.ru/userfiles/file/2750662898.pdfIn PDF document text
    • http://4bx.pl/public/file/kogin.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/58224933558.pdfIn PDF document text
    • http://sdds.be/userfiles/file/6159463975.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abd2b3dff0---12865228235.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aeba8dc7d8b---fozizedogu.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/79633446533.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/gutasan.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071dda222d47---xuxeropamediw.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/kasitevof.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8ab44b56c---41218282810.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160831be43af5c---62208685980.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/45449328763.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/22354165960.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/d6f621f7f96123dc465763e4fc90c274/vozokodesexeduvuf.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/65522797008.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/kokagowarunojulegugos.pdfIn PDF document text
    • https://schmitz.cz/res/file/99213225892.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/fajokalura.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc2d16dd8---guwarizakuvenademijirogu.pdfIn PDF document text
    • https://tusenfotingen.nu/anvandarbilder/108/files/buxosixirivo.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/28488917893.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/donimodujefufanub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=atlas+copco+desiccant+dryer+manualPDF 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_off00010fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDF 20032 bytes
SHA-256: a6ec1f770cf5cc43879c74633041867c8594f4443cd889e98165dd820fdc3862
font_01_sfnt_off00014495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CAC 10872 bytes
SHA-256: 5aaf6d72b7047a5daf20b1136933a9c7807f6ace4b329608342954328d023ce5

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