Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e9809f64594520…

MALICIOUS

PDF

78.1 KB Created: 2021-07-02 18:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5c38ee2078a3828aa5969d541c26d50 SHA-1: d4307638af162680b7d7355f6e670e0fc6881177 SHA-256: e9e9809f645945204c4940a6a42ea03ca6793d072b12e991fec76daf9b55b2b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. The PDF document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/c37b3fc0ad3acedabac8a64a9c9448b3/14745594789.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0fqsla0g76pa2gn75a9msknum/lerosuj.pdf
    • https://premium-house.uz/images/file/kalufiwevipefekuda.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/3789fiqs2v6g9p9cmkd6hfekon/pisuzufezad.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/504365756b678d615e775d17ff0e72fb/1290056563.pdf
    • http://sharon-barron.com/userfiles/files/21224411191.pdf
    • http://artside.org/data/temp/file/sagapawezapixoxegitozizi.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d974dc22c95---somojimoxopawupabitizefer.pdf
    • http://cintabogor.com/Uploads/userfiles/files/luzosewutu.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/9gpjgahq3shggufjigbhpe83cr/geromaxuzipatub.pdf
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/65109802864.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/r500tom7md9lnp63648klor8o5/68830826627.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aad139dc740---kenerobolaja.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160753a4aab8b4---85448106962.pdf
    • https://nffcd.org/userfiles/files/78877892024.pdf
    • https://penzionradvanice.cz/res/file/82586057355.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4d6e3d060---36014884295.pdf
    • https://bearings.vn/images/ckeditor/files/tedik.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085328ed4d26---refival.pdf
    • http://krossinkeuka.org/clients/c/c6/c64aa726effa6776341672ea469011e7/File/potom.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/d045f384ba40e4818cd27040f8e74684/11618481001.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/4he2f8e3mqdd0a6mvmuau3tcpa/37339608299.pdf
    • http://jamessham.com/admin/usercontent/file/zalafukumepojeja.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/d53651e42052ae33fb530cae95a2ba2c/35664281435.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=year+off+after+high+school
    • 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_off0000d063.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD063 16792 bytes
font_01_sfnt_off0000e875.bin
146ecba682ae591328b3bf8430ab6f92c1402693c64aa81165d17e96e90f7e3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 16504 bytes
font_02_sfnt_off0001132e.bin
75fe4cfd107fe9ab34dfcca2457011c8451575562b6e1aa7060ac60a06217308
pdf-font-stream PDF embedded font (sfnt) at offset 0x1132E 10492 bytes