Malicious PDF — malware analysis report

Static analysis result for SHA-256 f394d542bc500702…

MALICIOUS

PDF

81.6 KB Created: 2021-06-30 10:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4598631333b9276aef562b4b37bc4846 SHA-1: 8cd950e5748e5406bdcfa45b820f965b6684c55d SHA-256: f394d542bc500702fffbc708232e8eb4dd896dd5f3648ea1f7697b39202aacd7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan, and an ML classifier indicating maliciousness. The document contains a link farm pointing to various PDF files hosted on compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the callback lure heuristic indicate a phishing or social engineering attack, likely aiming to trick the user into initiating contact with an attacker.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa7a9c65d4---ladazu.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ngqn0kkaqiourt2ihr0sqf3hpl/82459074109.pdf
    • http://chapelguild.com/images/usr/67079120210.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f46d328a701da5a6da82737e092a11a0/judixu.pdf
    • https://abofahed.com/userfiles/file/mufimasaxid.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/4b3c0280096ce4861ce08b455cf6f026/nozoxokemiwixipefapuzib.pdf
    • http://nowator-zpu.pl/userfiles/file/20355020253.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/gih2at5jhpc0ari48kd1einjbe/bedab.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160846da734ee0---78430321017.pdf
    • http://campfirewtx.org/userfiles/file/84859727721.pdf
    • https://avayemehr-carpet.ir/data/file/96063279028.pdf
    • http://adamlegal.com/userfiles/file/xakuzuwomubun.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/tjjg6tgsm0ei13gfs740d2oqu4/34805583215.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160af7d6536601---78775506005.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/a1u0foqsvtnjnkrrdb74r7497u/75977157319.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ejo14uhvba2j71qf97l7718l21/vawota.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607db722c097c---kowadikejatojila.pdf
    • http://immobilieninvestors.eu/userfiles/file/widuxuvuratesig.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcbbee64e3---libofojivitokebatifojebek.pdf
    • https://cupanghitam.com/contents//files/fivakagewosa.pdf
    • http://curry-box-deluxe.de/userfiles/file/67688101775.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=material+cold+rolled
    • 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_off0000e033.bin
1c5f09393da15e816a9284db03aaabe376a3e93d26cc38b1f6266c579e6993d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE033 16520 bytes
font_01_sfnt_off00010ad4.bin
99186c257590c0247e881111e8679bcd71d9b39b0a1c58d42a0c16b5f0d11e4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 10084 bytes
font_02_sfnt_off00012166.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12166 16792 bytes