Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1361b862a24e657…

MALICIOUS

PDF

64.8 KB Created: 2021-06-25 07:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 79fb972e1d403a865b2bdd1c5dc8c4de SHA-1: 3377e0f86c04af533c318ce898eb727357459b60 SHA-256: a1361b862a24e65791acd1e98cb33a52841c152d88d23694b353242848a2e315
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. The document body is heavily obfuscated, but the presence of multiple links suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7867

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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=since+crossword+clue+7+letters PDF link annotation
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf67dc0c614---13515373630.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/48536834115.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/sefolewotizaw.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efc2d1e140---2499557360.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/dab8f95c1fabe99d85c8cc077350f740/furegazewunekawelub.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3925fedd0a---nufepi.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/25831142874.pdfIn PDF document text
    • http://jarosi.hu/files/file/venuvasamo.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/667c0a119ecdd0bb34c6138c55c7c7c0/wijujumosojavexigifuza.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/zexukadaxidanefejariwizam.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/pixofiratez.pdfIn PDF document text
    • https://yuss.it/file/dalanimavod.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b02cf76af77---90865133168.pdfIn PDF document text
    • http://boursemoi.com/userfiles/file/rexorunegubodagolimelesid.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d79f4724b6---56960877524.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD024 4880 bytes
SHA-256: 7517788db4f422f2a69ee0afcc5468fa629e29116975f4f51afc7d29ca0bac6e
font_01_sfnt_off0000e0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 2536 bytes
SHA-256: 2aafeb3caef7c120940d5cb42cd8a4eeb90b059dba352d5710730ed33ba7ab94

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