Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e3b00045a763bc…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 19:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b639dc9327037dc8f64e7c2c5f320a8 SHA-1: 43f92a59cf710d907a5762559a9dc4a6e7e95c7e SHA-256: 51e3b00045a763bc6c2459a84ed661097dd2d471032db3f0cf55acc74c08363e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to lure users into clicking malicious links. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://1hozain.ru/files/userfiles/files/pobezanojalefakidi.pdf In PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/84de2d1bf138947643e56974ac6a4d71/74867927504.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad507d68a8---52383359820.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/ketunejovamelatoka.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/jifutadite.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6afd558e57---14717843262.pdfIn PDF document text
    • http://wohingltd.com/userfiles/lukukiminiwasinesategu.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/jinivarivemaxufego.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/mumizatazubaruv.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab52324f993---52640861213.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/safoferemewenuluv.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/menawupiboripizavijibiked.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/vasutabisofojowodifilini.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d1371ff6b---nufikolimuwogotikije.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff0797c92---90527784040.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/17108373345.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/fj267s74vhrinf4mj8j693gb2q/56074163739.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611726fdd8187---46471721403.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608101e8c8145---gumexesi.pdfIn PDF document text
    • https://hcviet.com/img-phuctri/files/wokesirinivelunimetu.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ff4506025---sitefewoxawupexase.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57fdda43a8---puwivurefovalusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=lightroom+7+system+requirementsPDF link annotation
    • 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_off0000db34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB34 18668 bytes
SHA-256: 27f7cb7ccbbefa50f8e805cb0a91de1915f4d8bd98b40da45e95b79986bc77ea
font_01_sfnt_off00010b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12342 10712 bytes
SHA-256: a22018b44f23087d998cc2a264de866f7912739cf50232eac9fb62d400262926

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