Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9bb0d854ae4cf1d…

MALICIOUS

PDF

99.5 KB Created: 2021-07-02 07:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8d645600e94db10a7fbbf26c03efd8eb SHA-1: 0bc869ded89db9ecb8ef7bfb5b33f4064e860433 SHA-256: d9bb0d854ae4cf1d0be30f10d729614a58b893245f1f41f09923f4f50ccef848
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress instances, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/67cl45bd4fc437un1c4rnsssfo/zipepulititiz.pdf In PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d84c1d7ae11---sibiti.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8da35e005c---jigakorigunetikadimave.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/12938336600.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/q3lqmol8b1m059l2f6fjn5qv33/29393261141.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9ee2ab4b9---xepavozenotezuzamomimip.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6b1f9bc46---18526982392.pdfIn PDF document text
    • http://maidichike.com/upload/files/88229584928.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608874f86c72e---68496383882.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210531021832.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607196efe3923---venejikotuvuv.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a429912fb---5326853361.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/46751190309.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f443ab5a73---pixefoforefuli.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/d4472aa3f03e2476205ab10bd6afd888/27536556996.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///nowajelobozalowebotupoki.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/7ba9b9450f6acecb24477536360bb368/47536086193.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160de77ceca843---lorotugogorevaz.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/vixonijar.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/dekobapajor.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e08dcb68a---roworisuke.pdfIn PDF document text
    • http://grabnerestriche.at/metovanexotimag.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/sozumidufajuvonufuloxi.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210508234347424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=african+university+foundationPDF 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_off0001219f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219F 17576 bytes
SHA-256: 034b06b75ca2dfe9241191a74f2f2a568d96d9c00d097fb68ff569122869ccee
font_01_sfnt_off00014fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000167f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167F9 10684 bytes
SHA-256: 27cfe77f9994ee1ce15fa4371e5c9133538f0f72e9d0f762d30b44b2df039315

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