Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb9a3a62ec4980f…

MALICIOUS

PDF

96.0 KB Created: 2021-09-06 05:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 135bfd26224fdb167cc2ec2569952038 SHA-1: 2216938e0be7c72532f70abc2686ed574976de52 SHA-256: afb9a3a62ec4980f9ad23fcb88f1087593e67f48fb0a94ce3a21b1118cbcc8a4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic firings related to URL link farms point towards an attack pattern focused on redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ketchas.ru/uplcv?utm_term=potentiometric+biosensors+pdf PDF link annotation
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160936be8355aa---29232375120.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/40025995706.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f556a39515---texidilapupigaf.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/40067691833.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/nimasof.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/0d2008653c9ccaf2c394c15d77e699eb/93015731724.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099ab11b39f0---vabepi.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/89562326424.pdfIn PDF document text
    • http://humanlitech.com/files/files/mivofewagemukifofa.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084459f62fb4---ruwaraferum.pdfIn PDF document text
    • http://podushka.by/files/files/17322353963.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/nabulunamigitasim.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/zuripifikodagu.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/kekazebiginudirutulol.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/rusalokojiduzenevor.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/kumopavenajotabiwavunaw.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/bimadebakaxenunemofamav.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40fe64c3d9---46432349836.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/2680745437.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/76776583425.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210806080723.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/70244789130.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/xigipaxafa.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091b0261d178---zagosupibufozuxidunax.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_off00010d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8E 20088 bytes
SHA-256: f5563b5dbce232dba1239e0d10e9ace51bcea7ce22d67bc35cee6dc4d072d32a
font_01_sfnt_off000141dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DD 10716 bytes
SHA-256: 8cda4adcbf7baa3654b0a7a960b8bf9e31e4c68968b6a4faf5b84eca99c1c017
font_02_sfnt_off00015a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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