Malicious PDF — malware analysis report

Static analysis result for SHA-256 98bf21ed5a13bca6…

MALICIOUS

PDF

71.8 KB Created: 2021-06-21 18:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ee8ab4c98d420ae6f87246871b92883d SHA-1: c8684d1981e9e8ad870861af27514a264aa90421 SHA-256: 98bf21ed5a13bca64ae17ff71c3fde00342d0f0f874d89c629570b08060a985f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of multiple external URIs and link farms indicates a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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 http://woodwork.pl/ubezpiecz/obrazy/file/fexanisotiforaxukizasof.pdf In PDF document text
    • http://brezov-gaj.si/uporabnik/file/kezamejarewojiwakutiwu.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/medumivasagitomurabal.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609d65a5835d9---xabelajetular.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081952c5c750---doxitik.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/tuxopilasexoxumonupo.pdfIn PDF document text
    • https://congchung7.com/upload/file/67684539062.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/wafaguvozalitu.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/jafoxod.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/xamaxaduximuzikewop.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/revoxobijosevijesixilemom.pdfIn PDF document text
    • https://emmaushuis.org/pages/nebakulalokosagowesolo.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/2900fb5eb6b672dffc82aa6f2e7b7fd5/lujubenejogegexexume.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210606171239_1533031507.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/20418093909.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c288cd11761---lebuleresepesagikorevok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=resume+format+simple+pdfPDF link annotation
    • 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_off0000dddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDF 5196 bytes
SHA-256: baa51360048eabe65985b5280986b04a6503fe7abed70f2a62c0e3900ceb994e
font_01_sfnt_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 10332 bytes
SHA-256: e410ca578f395077a1e36f54cacbdb8d3e59db9aa03ed0c5ce5c3ea7a15d0e73

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