Malicious PDF — malware analysis report

Static analysis result for SHA-256 6781fd26250a449b…

MALICIOUS

PDF

83.3 KB Created: 2021-09-11 06:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: cd7f74556f21b814ba7ee3d5f71d8940 SHA-1: e409ac87b6580c94093a5ff12e1b718e51e2dcff SHA-256: 6781fd26250a449bc085c5a760792a4f5ae32663172a4f26fdd4dce9ce5a5744
176 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The 'SE_CALLBACK_LURE' heuristic further supports a phishing or scam pretext, likely directing users to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://10kshot.com/customerinterview/ckfinder/userfiles/files/21116332116.pdf In PDF document text
    • https://fetogram.com/images/upload/files/90298282329.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/25500661973.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/mufenoxenuxuvoligelexa.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/65001457897.pdfIn PDF document text
    • http://canadianrockies.info/files/file/98784059658.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/sagosubevakutorilep.pdfIn PDF document text
    • http://pinxedien.net/upload/files/61529342943.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/44908778138.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/40692833596.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/29149371882.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/38738500049.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4ef24adbe909b9285854d5f782a4f373/30867392547.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/basire.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/vedoxamadojorinaxa.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/modoradexu.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2aef9fb9f1ff62751eee4332f7b0722f/2119595160.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/22339216722.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/73311408839.pdfIn PDF document text
    • https://robodom.si/files_vsebine/60396561632.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/kuwuwemiwanixorase.pdfIn PDF document text
    • http://serting.eu/userfiles/files/34742609823.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/wofororarepumifobatewatup.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/kadiku.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/48388556184.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bc28ca0e2---zewowebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=j106h+pit+filePDF 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_off0000dc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC73 10132 bytes
SHA-256: 4740a8dc82c6eef8939b89de4b5f4eaa8ddba664300fffe024ed0e5bb5f4d034
font_01_sfnt_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 19964 bytes
SHA-256: 535fbf7e227838ac0e864f701322317ee751dfcc816305a6fb590e29e8f28cba
font_02_sfnt_off0001283c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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