Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f5abf2618ebfb8…

MALICIOUS

PDF

73.6 KB Created: 2021-09-07 22:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd47fc470c53ef67bf534bcabe5ed49c SHA-1: 9bca3ebda39c9ded06ad920b09a7d65208755c1d SHA-256: 09f5abf2618ebfb87de0ee60318ecc2544472f91f6c16486c6db83a9ccada0ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs, such as 'https://inwebjor.ru/uplcv?utm_term=logistics+and+supply+chain+management+job+description+pdf', are likely part of a phishing or scam campaign, attempting to trick users into visiting malicious sites. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://inwebjor.ru/uplcv?utm_term=logistics+and+supply+chain+management+job+description+pdf PDF link annotation
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/8e3c33c0b03c58f675eba4913bc04126/57337988244.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/jakugapijaji.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c4651bc5e---44358406309.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/10a77685b22a2cbc2ee14581616bbca8/95748876927.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/66246497339.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/57377327643.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/xuvakobiguvexebijid.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/4a4c4cf3da37e76105c96b25ef129387/97891204353.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/48960251289.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/28091625156.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/86207086758.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/5ccc0dad6cd058f2b16d93415baacc57/46350426398.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/60886827618.pdfIn PDF document text
    • http://atek-ent.com/upload/file/togojobozonejuwuvoxome.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/likusorivuselalo.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/78203138630.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/gowilamizawuvabo.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/bafigoxojoxebuzelibi.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21ac269b8d---pejenelaneri.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/e25d35f5e0c7e6e518cc0b0bd3c408cf/sikajunagaleberoduligazu.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/basemigokinifiwirufidif.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_off0000bc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1E 11508 bytes
SHA-256: a1c7126f7b0d6e88718fe7989070b4b0f7708bf59713b75dd9bfc281474cf123
font_01_sfnt_off0000d6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B8 16500 bytes
SHA-256: f6d7b6c1480ff880db8b7ee07428bc780af176341aeea589f9113ae4a94d6feb
font_02_sfnt_off00010095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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