Malicious PDF — malware analysis report

Static analysis result for SHA-256 e302acfbbfc5d33e…

MALICIOUS

PDF

83.0 KB Created: 2021-08-01 02:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d70377d4cc6950c802fcfc28dd97b9a2 SHA-1: 8e8987532b8467efa06421876c9c14679337ca7e SHA-256: e302acfbbfc5d33eb4186898c2772753f0b073a8e24e7fd0083e59298c401d94
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/23874dcd6d71466eaebbe5029b9de113/75430834953.pdf In PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/74a0f2350c14f640f44c2a4c2aff76f4/jilaxub.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/19224060834.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c881ad15ff---12631812583.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/63794244482.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/najeni.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/kafarimupak.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/83400133720.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/3236831693.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/vinisapudixuzoj.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/pj6tmdm5q64u5q85poi89d7v5j/85012688286.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/desesufokitirexatope.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/n6ivt454890mjqeb08glf10uv4/kupenudovumudotut.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/27868376390.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/47353533093.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/lufojawimikinuk.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/rupuvimefikinol.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/45276735265.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/vekejetelikul.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/80671052670.pdfIn PDF document text
    • https://buka.ru/sadm_files/nuvamunogovebigiduri.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed9816f9c9---gorotosewab.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/9806061184.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/bitgp1ice970dn0k99ns0vdhs7/94305742984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=descargar+mi+primera+encarta+gratis+en+espa%C3%B1ol+para+windows+7PDF 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://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_off0000da47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA47 18064 bytes
SHA-256: 0a7f8622cefe5565b270f34aea227348f0c86a3de117ad6b9e061b99b5c61bbe
font_01_sfnt_off00010899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10899 11200 bytes
SHA-256: 356a89b4234c4cc09897bd6b5f8157dbddaf37b7b0e9e934b5564f4860940075
font_02_sfnt_off0001227f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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