Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb7fbe686605218…

MALICIOUS

PDF

78.8 KB Created: 2021-09-28 03:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 652731f3939dd55cdf462b5e7d43a85b SHA-1: da3dcdc578b09e5c4a5eb6eb6992e8eb2a0517be SHA-256: bbb7fbe686605218d1cf9e2214e8ae0532d87f465876cfd4b48a1a6a867d2619
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to domains associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted from this sample, but the overall structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://pixomot.ru/uplcv?utm_term=android+all+software PDF link annotation
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/bebul.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109020835354434.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/44390086880.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a8891c3b456d6d6d66dfc52abed47fa3/8794377496.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/16896918653.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/e952fe56266da27ca3ad92e307a2c6b0/raxojejobukivuwa.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/lokugapovigijitejag.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/41282491705.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/37206735299.pdfIn PDF document text
    • http://korytnica.net/data/files/12812440819.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/59575633791.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/695735574.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/37690871773.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/13912520648.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210907091418.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/liloguropidofonen.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/40579997554.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/45612800867.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/jisefujejanifirefamizizef.pdfIn PDF document text
    • https://capecoralliving.com/media/file/mawifatit.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613bab20f3150---89861152883.pdfIn PDF document text
    • https://ms02bet.net/contents/files/lujegij.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/50262557802.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/74472308929.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/baxetexinoxesiwepu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e06d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE06D 18232 bytes
SHA-256: 182694dcc4955b3e0578dacf3112128def0a670cb8cb7bab9067e27debb83aee
font_00_sfnt_off0000b45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45E 17328 bytes
SHA-256: f646077df73bc0911423fb5cfa0f6e9a0aef42939334b6d898a1558537634453
font_02_sfnt_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 10412 bytes
SHA-256: 96f0e1373e6e97febad13cd6d1f42ebb645c3ac9a39ee39debb5028d03adadb0
font_03_sfnt_off0001152a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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