Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79806bc17b1b804…

MALICIOUS

PDF

74.3 KB Created: 2021-09-26 00:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3a9e991b69a47949f5fd1706e2beea26 SHA-1: 229dbe5a797f957c88047028113c95c4f6467003 SHA-256: f79806bc17b1b804eda811ab8e1f02f43955357899641ac2449687b375666e2e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of a callback lure heuristic also suggests a potential for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2e4420818---turatinizabifegax.pdf In PDF document text
    • https://atarentacarburdur.com/userfiles/file/pemavuxonixamojar.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/98293708561.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/bapojirafowatetudugogowu.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/60914976518.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/20564467498.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/sololujuro.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ghthjop6p7q6qdcaerorllthok/51277637491.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/gevilorusipukezevi.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/84541355928.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/vevilimapusamige.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131b9c8d7306---berafegunenelujipijox.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/46378906866.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/43977909989.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/jolujulesi.pdfIn PDF document text
    • https://wrd13.com/force/file/5196416251.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/laxuremulebipinosum.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/ralanerex.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/hnnuc5v9quhgdt5g1fl5q5bi4t2lt1b0/tekavufolo.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/62977507481.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/85781333420.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/71ea993b8e013ca9381ab8366e0fd4f3/40663686244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+i+create+a+gmail+account+on+my+android+phonePDF 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_off0000b7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EF 18716 bytes
SHA-256: 628e2f3f9147a6c8c53459e4b4b1460c8bb9a68480ba574c3a850eab15c68e0f
font_01_sfnt_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF8 11084 bytes
SHA-256: 25eaa34212953e8eb204c2dbf719808160c43da5874364fa93e230753b07aeb9

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