Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2e437f838467e2…

MALICIOUS

PDF

83.2 KB Created: 2021-06-25 12:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 6b179343a164bf95173f14f7ed61fcad SHA-1: 9f9e3bc9db0e6edad5c776aa85281414b5dbdfc3 SHA-256: bc2e437f838467e2ad2d6fd7f79b3945eb4fe13757be3f31886a12c144a5db33
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or scam campaign, as indicated by multiple heuristics related to link farms and callback lures. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the document's structure and embedded URLs point towards an attempt to trick users into engaging with malicious external resources, likely for financial gain or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://infrive.ru/uplcv?utm_term=texas+drivers+ed+questions+and+answers PDF link annotation
    • https://elektrona.cz/files/file/vukiw.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/9bf530cd526a64af6c8502c6bca5b899/73567554576.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/fa5c2ebde98ad190cf5ae62d27301f78/29803616449.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/19219192515.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ii1b39ka8nrrad9pd4bof4b2ub/82818142445.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bc13130a7---xebawo.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/1044878393.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/tekajukapuxotuxo.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/9b5376882e30e28e38d32eda63b4d5c9/wujenowuwonijolirenu.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/34392799839.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/ba5b01a46ca628ef33f19f61c662c79b/metezemomutovumi.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/2a356ac9d0556929f791e5f7fa72cf53/7251646815.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/grrr1172er7ntbo9fntkg490s1/15333207502.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4354d2c07---82577822195.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4b7ca776aff65e7ca06b0d2b655604c5/gixoku.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609847efd5df0---dunowenopa.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/63d14260f6ff9489d60265d393e1f875/56572301570.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/a9420c2bfaf2d581e98aacc58d658d06/vugevuwigaredakivux.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607cda506a902---30335861714.pdfIn PDF document text
    • 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_off0000e037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE037 10656 bytes
SHA-256: ba57a7094d9fb0e6edd8a6011ee6fa29592b88f6f6f088849f0906f3b6085458
font_01_sfnt_off0000f8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B4 17752 bytes
SHA-256: 10930d641fb0d0dff102a58cba541e013f94e604bffcee0fcdcb6cdc080acc02

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