Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bac6913aed2a1df…

MALICIOUS

PDF

72.8 KB Created: 2021-09-05 13:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b49587a64c00549aa34505dba6651f4 SHA-1: f5f827045c2e13324e9467e96c982fc0d3d30981 SHA-256: 6bac6913aed2a1df6774b7870cf9e69809c0948d754ccca38b2fb227ea95cb7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly suggest this document is intended to lead users to external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nomylo.ru/uplcv?utm_term=breathing+techniques+for+relaxation+pdf
    • https://faktxeber.com/resimler/files/40235369980.pdf
    • http://lookkorea.net/userfiles/file/63778425789.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160944f460cf18---pedovereluvig.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16071aff811c36---57588804496.pdf
    • http://emmanuelmissionarybaptist.com/clients/74938/File/nasireraxajemup.pdf
    • http://giasuthanhdat.vn/Images_upload/files/pekiludukereler.pdf
    • http://studiodebiaggi.eu/userfiles/files/wujixezolofazurakuxan.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fa8abfaa421---74774917586.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/88242a513042e2937e4ba2a69ed81766/16398958238.pdf
    • https://tedvandergulik.nl/userimages/file/sapokinipugurakuwal.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123818ed20ee---kijelezuwujexejutak.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6877fa93ef---xobekiwekowanara.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/4af7ef8129fa49c64b72a2e6b30c01d4/fatalubemenu.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/bc1b41f75ba7ea1ff968f95fef0f7a12/gugugofekogelimisebarox.pdf
    • https://baatco.com/ckfinder/userfiles/files/53247927135.pdf
    • http://linhkienhunganh.vn/luutru/files/98821721486.pdf
    • http://abwessex.com/uploads/files/zukufewojunazitinajeden.pdf
    • https://advik.net/userfiles/file/tikesiterijidoveguv.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd3f04e13a---beririkimakaginefize.pdf
    • http://tvkinter.com/file_media/file_image/file/20597342709.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/635a0f16c6ca5073b1c2d5512be72059/vegakomir.pdf
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/zijowesilurenodaw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b865.bin
e561521a8fa1f70d582f2a31d544395f62ab5c88a4ab32ebd108cfaa4ecd42ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xB865 17344 bytes
font_01_sfnt_off0000e3bc.bin
6b056d90416a71c33e430875fcdc09d10f96fd77cdd65d89457555b3eebec670
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 11300 bytes
font_02_sfnt_off0000fdc5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC5 16792 bytes