Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcf0ae8d36df110…

MALICIOUS

PDF

86.1 KB Created: 2021-09-02 09:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c3c8f7becb562ce5357484d0356fd8c5 SHA-1: 2131e1abca0ad7fd29d0d563912806534b8d0adb SHA-256: 9dcf0ae8d36df110501e74e05fe94a0ad4fcec9d7d152228d0314084b01dbae7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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 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://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079564668eaa---xagezesotage.pdf In PDF document text
    • http://granite1962.com/clients/869125/File/bobedizosofanazoxagixep.pdfIn PDF document text
    • http://ptogel2.com/contents//files/digirowibegubonegunizumuk.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021080501282089860.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/dukiwilusorovoti.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/1259552169.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/ruzulogivaneguzuwe.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/10173713667.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/zilevatosa.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/95584982639.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/webitilenova.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/videfod.pdfIn PDF document text
    • http://clarasonic.com/upload/file/19918818412.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16118fcc77cb2d---gikitufazixumogorimupuw.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210504070324.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/f4ca0f6dd2278035f70cb642c3511870/95933496405.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/xemakopozurofa.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c30be0385a6---seledetaginivitebo.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/vuwojefagusavirifo.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160926d7a02bd5---31712665468.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/18005918262.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/53762253827.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c67642fbc---pogodubesogekivuva.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/kaxawefapuvasizagikeli.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612c65fe9cd9f---32268294747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+open+air+museumPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f3990759f68631aa2f53aa924f848bcd/51539788.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_off0000ea8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 10436 bytes
SHA-256: 171cd0db8a639e2ed4c7cbf82a2f83c5f86a3cb7d6505a6e14a142a16c219995
font_01_sfnt_off000101f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F7 18688 bytes
SHA-256: c2f1b8fabd08e5b7ed66ac9e74800c195f93e6ce83e5f891a6ef21fa68a2bda2
font_02_sfnt_off0001323a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1