Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe98d4562c07af8a…

MALICIOUS

PDF

71.5 KB Created: 2021-06-06 12:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3b84964e20a361c28f3652c702e00b13 SHA-1: 30c3644c5c0676af47996528467a007884920a0c SHA-256: fe98d4562c07af8a2f5c43675d023dbc6068ade11337ebc62b9efe2ea6c1e3d5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The document body, though partially garbled, suggests a lure related to educational materials, aiming to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=solucionario+matematicas+ense%25C3%25B1anzas+aplicadas+3+eso+santillana+serie+soluciona PDF link annotation
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bf91222a6---vunigaxixusarow.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/radoz.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/xezikuvavuwobofenuka.pdfIn PDF document text
    • https://parfumzone.ro/files/file/wawumabugolegarelar.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5416fab425---75643762001.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16082b41fb0de8---6611581371.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/3e3015b6f27d7a9210f0818d5ea435c8/79941570934.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/29464395186.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1939125ed914f7682bfaf2201d63c2e4/gegumugogiboxolivegotike.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac30924ba9e---remuginolu.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c02a440d04---poxitojedivi.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/896922e4006fe64fb0f7cf61babd93a8/72331926903.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/opiuigv1c1tkgu7b2lusrgtg03/kofoperakujot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB68 3052 bytes
SHA-256: c1e78626305b4afeaab6ef51faf3cd44622ccbc64b6b126474515d64e36fe099
font_01_sfnt_off0000d649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD649 5748 bytes
SHA-256: 6513e40f08912933f74ca0b3be76dd7d63917978d2e6c4dc290d8daf84fbc1a4
font_02_sfnt_off0000e985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE985 10884 bytes
SHA-256: 7d8aa61ee13d86ce1540bf44099bccfc325461ac117777ec756f58ba4fd67876

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