Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b322ec96038d979…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 05:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db3eee7735bbb3a9fa22485e2162f3ec SHA-1: 78a533282f1fb84a9ff6b6ca7d7e7eaf50cff289 SHA-256: 6b322ec96038d979a6d264aa8a2111cc1c86e001b0e827782fcfd5f2b0ca1d79
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The 'utm_term' parameter in one URL suggests a potential phishing lure related to product manuals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://catamma.ru/uplcv?utm_term=dyson+pure+cool+fan+manual PDF link annotation
    • http://thegioituigiay.net/uploads/files/rekave.pdfIn PDF document text
    • http://juncheng.tw/upload/files/3731129082.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/6121122931.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/dlhv6j0dhvpd99sknhdiqttfqn/wilutoteropumabun.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/pupumekokazutusugatafaz.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be70669225---kapunoxolefegib.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/91462063444.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/43367144519.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/80158864579.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/vobawonowegobu.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/oqtqgtqqnf5aphqivdthnobcch/78185195368.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/8u0gplsi655u0pjqtv8jsa54a2/gonavokelivipipa.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/54153965559.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607999ef7e4ed---wupivatapaxela.pdfIn PDF document text
    • http://word.mn/uploads/assets/946890530.pdfIn PDF document text
    • http://change4best.ru/upload/file/bogekefuwelujun.pdfIn PDF document text
    • https://t2sc.me/userfiles/96318666414.pdfIn PDF document text
    • http://ropesadventure.com/d/files/tidadoxikakaveravobomawu.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/88773898795.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/31716035826.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/23901637461.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098719b08675---werazedab.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/digojudipewunuzumiboganer.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607491b60ae98---xobugesatumifofugakad.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://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_off0000d576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD576 10668 bytes
SHA-256: 44c72aa52620ba476c2ce6b9293a3025b944412fe1d375326166abb3d2aba46d
font_01_sfnt_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FE 18352 bytes
SHA-256: f54608f12dcd3a521fc926bac7c62182df6f0b377b874e00e237db454c582521

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