Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f951e5e8e00c33…

MALICIOUS

PDF

73.4 KB Created: 2021-09-08 05:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: bc0f49eb806667669807bea6cc4fc270 SHA-1: 6ea25ec3bd353927b847d079e16cc2e0a0c471e8 SHA-256: 39f951e5e8e00c33eb57363cb1546bdeaef4ff5dbba74a874473ec1a1e317b21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs are consistent with spearphishing attachments designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://philabc.ru/uplcv?utm_term=le+courant+electrique+pdf PDF link annotation
    • http://bhavalaya.org/ckfinder/userfiles/files/wikapajoxofu.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/39017687298.pdfIn PDF document text
    • http://abnicum.com/files/file/54116465762.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/87841078645.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ff8e5cd63a---54608510772.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cee9e6430d1---78473456318.pdfIn PDF document text
    • http://recrute.fr/files/files/xapopazofenikasa.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/luredafidekozuvamarik.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072a3a363237---xilalokam.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/15320836346.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/jt46659f2o1g6va56q9k47s5s5/nuwen.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///mumavuxuxagirorikoxatad.pdfIn PDF document text
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/jidokavuniwarobe.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612b1bf3bdd15---danomakunisoxotenubun.pdfIn PDF document text
    • https://preciseenergygroup.com/media/75240093305.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e930c2f7b1---tawufubovitasavazi.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4436cec13---23788957823.pdfIn PDF document text
    • http://amdind.com/userfiles/file/79708613517.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/34489430514.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/47916084161.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_off0000bb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33F 17844 bytes
SHA-256: e23805f9fc34c106c0a21be85b2c0022da88c0a44beeee8d45296d16d75623ea
font_02_sfnt_off00010062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10062 10648 bytes
SHA-256: fe3bbc94b02e125bfdb16f72bc4afea216a5c4f9de493fd8986ff8417c824b0c