Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f8d50216e5d7a8…

MALICIOUS

PDF

80.1 KB Created: 2021-06-24 02:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d6d31564f0496c2f471611a821f29762 SHA-1: 0cd66a9d9a8f1f1d1936879e0db7779d48d2872b SHA-256: 33f8d50216e5d7a898daebc44183b0f9369b4a3283c5068b0e25dce301d6e5e4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct instructions or scripts were extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=sitra+norms+2020+pdf PDF link annotation
    • http://c2ctrading.org/cms_upload/files/58719292176.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/mowufomaz.pdfIn PDF document text
    • https://betibg.eu/webroot/img/files/22409135117.pdfIn PDF document text
    • https://nasikampung.info/contents//files/19596494250.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/1082b72dd56984267ea1e3a38c3b4734/26742563811.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21cdb3b367---7506402709.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/bv7d7ahma4qsgglbkaijd172b3/xapufanurepivel.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608daca3f1467---tibakagibukalosezesuzapol.pdfIn PDF document text
    • http://falerisztika.hu/tmp/9625938181.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/97541564334.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210608234227564.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/aae88996322b363af9d696caa217e6e9/30258943689.pdfIn PDF document text
    • http://mcleod-bobbitt.com/clients/64742/File/fokezufivafavuneni.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/5d735e2c821144cbf58705f97b522456/54415321886.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b650e7d8fb---metagune.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/og2vs9t6cncgmnmvq22tv9gg4a/5079968607.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090257cc1f0a---devuvonofife.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608273fc75c33---vokinotuduzesak.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF897 5532 bytes
SHA-256: 607870efb440f14a54835fea5f8d4e3358f8ebe49c89814b69a26a0f814a361b
font_01_sfnt_off00010b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4E 11800 bytes
SHA-256: af4af4c0f23ee446ee0b737211cba1288af852dd232b7bb8ce2b11736eb56246