Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4f773748d512f2…

MALICIOUS

PDF

90.2 KB Created: 2021-09-17 18:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 33ddf6722e3848b6e3c11713ede6b3ac SHA-1: 9f60536594d46533be2c2f9f42aec1b35516669d SHA-256: 3a4f773748d512f24bb7f66bb0ffc75c6c3c91523dd84349590a9924fcfa0c20
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains a link farm pointing to compromised WordPress upload storage, suggesting it is used to host or distribute malicious content. The presence of a callback lure heuristic indicates the document is designed to trick users into calling a phone number, consistent with phishing or tech-support scam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://miltonmattox.com/userfiles/file/83959996331.pdf In PDF document text
    • http://paitoonbox.com/userfiles/files/lisekagozajiji.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/0c7e2c4b13e2f97819a3f443961c27c0/zepidirevujeditekiwidis.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebbc77cdaf---wasemarexular.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368875543ed---zanatipufivedejadadew.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/18340409294.pdfIn PDF document text
    • http://orlickachata.cz/files/files/birugem.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/61571775179.pdfIn PDF document text
    • http://ustunongel.com/image/files/71218496758.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/sugaruzewe.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/pogupedobudofomede.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/bomukazosemifumogiduji.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/raziguzajideboretuwuper.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/niwipowozigilanufexunofib.pdfIn PDF document text
    • http://abworder.com/uploads/files/30634108421.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/tuwopivaronumub.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/beritageruf.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///xiwabasuw.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/rofosevoxin.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/2027449546.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/kunimixo.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161449c0b3a976---pixojurederobumizimigamur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=softbank+iphone+sim+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 11024 bytes
SHA-256: 6a56c80c6e0645e912648f4a97194989bd2c84341a285b58779a1732637e74b5
font_02_sfnt_off000112de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DE 2484 bytes
SHA-256: 961063bc4c3b9fb152e996f8169fdc9e3c9a597651e124a53ef826f5cc595ecf
font_03_sfnt_off00011d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9A 23488 bytes
SHA-256: 15ffd1ec68e1f342dacec89c94570b64fae81988cbb3b467c7e76d2d40d27196

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