Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1423caefc17647…

MALICIOUS

PDF

74.6 KB Created: 2021-08-21 05:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 39544abea12ff4aa5d02b55fe0a4449f SHA-1: 4ab805e45851598b0cb5e8879490cef8a4557d5e SHA-256: cc1423caefc17647ca097f540bd17a70e117b5b389811ab4efbf05bfaf70e76e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or scam lure. The document body is heavily obfuscated, but heuristics indicate it contains a link farm and is designed to prompt the user to call a phone number, consistent with callback phishing or tech-support scams. The presence of numerous URLs pointing to compromised WordPress sites and disposable hosting further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://archism.ru/uplcv?utm_term=how+to+write+a+letter+to+change+bank+account+phone+number PDF link annotation
    • http://www.toptehnik.si/images/12526632475.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/2e916c737c320dcd53914ab48d08e894/33938676392.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-18/20210618010456786964.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/2541251760.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/46526950835.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608548ae6a135---bexakezuxapowoseke.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/resusobupedoxuxomarofasel.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/l290bngupsbjqsggtvqjj42ji0/11697864547.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160780baaca83b---satig.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/bf3974187bd576fcb3d688110da3a303/sasagek.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/2876197236.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/pomusulupekulupofawe.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f509ad3327---fazefilitudanubez.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/76801773962.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/9ab3679900970beb99ebe815ca9ffe97/41343435206.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ce53a308644---zowawidawukelirimefu.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082c39426484---xurojanafogok.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/gulunuw.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/milufuvoxedesemunow.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/tojiwizetavomevupadu.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f5d8622b8---lofukadi.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16087f045ca7a0---25318247070.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/ginekoruzewogezajojim.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/527a0ff755eb8df116388b3691960191/keretutawejokufabe.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c95b9d5ffcd---kipagifipemutuvowefutu.pdfIn PDF document text
    • https://cartolmania.it/file/feguwiwebegubidusupekovu.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_off0000c3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF4 11064 bytes
SHA-256: f029f7602a1df1ce387746932089d4dd5ef63bc9fadeefc7c1f4f01c47720aa4
font_02_sfnt_off0000f54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 14936 bytes
SHA-256: 2ebf461c3d67621c0e6a269ebed648848330c0f6a402a4c7f9663fe397841993

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