Malicious PDF — malware analysis report

Static analysis result for SHA-256 d139e6087f51242e…

MALICIOUS

PDF

90.1 KB Created: 2021-07-17 01:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 63e307e6f57f410afcab738b127e2623 SHA-1: fba8f59c4f3e23a2e2f9b6965dd09f6151a5a737 SHA-256: d139e6087f51242e2680c8e1d9747d8910d13566f91103db8f10e83f55d6dbdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The PDF structure and embedded content indicate it's likely part of a phishing or redirection campaign, potentially using JavaScript for obfuscation or further redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://n95america.com/wp-content/plugins/super-forms/uploads/php/files/4e9b4b8bac026afa3624f1e4624b1d24/winiz.pdf In PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f3c582f3d3a769dbc82b152569c89156/rekebazatakokifibefopela.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c2f6bfa9f---tesexem.pdfIn PDF document text
    • http://mega.kz/media/upload/files/20900581519.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16096ce152fa30---13025479358.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/78849241866.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/73f7380fb48e0b6fe5b70f1b0a564d7a/83494062637.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/31981094094.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a436aa9902d---37530392476.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/fibeferodobij.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160794a7d0bced---71857544129.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/ae5f43ffe8646596a94b68b43ac69bde/63598927906.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/jcamkooj17vn2lt4qoeuhce822/simafagobatelixaje.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/lizerevalukanufej.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/nk23emovj4mh6u862rsjpdvjg3/1313666785.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/suxekapexevopezivo.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087a15f2746f---femagukezibik.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/40435337159.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84dcb65baa---xibovozekebefo.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/moborubad.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/ec86f50a175e5e3c4a9a2ec81c445155/mawawifigafi.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/kixupokijunerexifaserujal.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/kobakamudigutuwexotun.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021071523352580554.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210702_599EE657670963D6.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+is+in+xanathar%27s+guide+to+everythingPDF 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_off0000f850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11067 10888 bytes
SHA-256: 421c59ee741d09c80164ef90e599cd629e4acfbe9a3a7736a1f475c5f7e48cc5
font_02_sfnt_off00012973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12973 18140 bytes
SHA-256: 499d7f58c73931e9e310c9a5833f2399040e7e9e2a61e220d420d2ca69968d2d