Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f9a349caa7d95a…

MALICIOUS

PDF

87.1 KB Created: 2021-07-09 17:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6907acadf29d0b55bb1885e57a3722b0 SHA-1: cae37b8185880cbbc4467078e8125236c1dc8755 SHA-256: b5f9a349caa7d95a2639fe18761120380057c599a635d01e73771ef6f8e6f4e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host phishing content. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://drafthe.ru/uplcv?utm_term=meaning+of+god+is+able
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/a02b86c4c1a7459f3547755a833d7601/ledak.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e63cec7318c---41125469347.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608589d59ee8f---34815236475.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/mupajexujositini.pdf
    • http://dyglas.com/userData/board/file/45631215332.pdf
    • http://geyikkimya.com/userfiles/upload/file/zepadufejewanegatupanu.pdf
    • https://fleschimmo.lu/userfiles/files/77817554092.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/905776c28a4417e1dbcd0de54ff584bc/1790257785.pdf
    • https://contabil-fiscal.ro/mm/file/25189981293.pdf
    • http://myshopgroup.com/userfiles/files/fasimunopakamudex.pdf
    • http://ulrike-mayer.de/userfiles/files/ponuzokinixur.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160963830dcb18---742619198.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d9ad0be00---83329553619.pdf
    • http://oryginalnedekoracje.pl/userfiles/file/24385140555.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e613465e807---sevilejudige.pdf
    • http://c-amc.com/upload/files/67790932780.pdf
    • https://espiber.cl/images/uploadedimages/file/75131930245.pdf
    • https://temahr.hr/files/nepebuvis.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/c67727afc25580edcbb971087e5d6687/13857601650.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/56317512278.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9a3c28e1a7ebb93cd7fb12a27506a8c0/25361045787.pdf
    • http://suamayin.biz/userfiles/file/84627198270.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_off0000f1a6.bin
f0e895d04fcbb3f58d3ad61d7912e5cd4fabb6a5823766432a18001efb537f11
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 17648 bytes
font_01_sfnt_off00012000.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12000 16792 bytes
font_02_sfnt_off00013817.bin
946a3a814429fcbe690862deb3aa626503e025ebd7ff8c7abe9720eca3076237
pdf-font-stream PDF embedded font (sfnt) at offset 0x13817 10464 bytes