Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6622eb5f14c82e…

MALICIOUS

PDF

85.3 KB Created: 2021-07-02 00:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5063cdbde7635015ffd9dd15a242ad5 SHA-1: 61a7b736f94760f38209e2bbded9225789268c8b SHA-256: 5f6622eb5f14c82eca571da6b9f8ca329cc5a2f81914742ded3742e321b1fa1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links pointing to compromised WordPress sites and other domains, likely serving as a link farm to direct users to malicious content. The PDF's structure and embedded URLs suggest an attempt to trick users into visiting these sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://drafthe.ru/uplcv?utm_term=the+two+towers+online+free
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160913ce079a17---wakukigafedodelir.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3ss5512084oniepu63bubm19k7/42282953814.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160955c0611465---gutimonu.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/08f6e85c8db919c3049b8bbec0dde98a/nesenanigemaxoro.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607949260387f---refebawaxebufuzibotaf.pdf
    • http://csc020.com/userfiles/file/20210619182203_jw97rp.pdf
    • https://alzubidi.com/userfiles/files/lidufuvovobixurifuniga.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f33645fae5---2578319588.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9a01cc0f5---62970475959.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/b35kskhdc2jphclpnau98sr5tk/luxekukunija.pdf
    • http://azizolace.cz/images/file/salev.pdf
    • http://slp70.com/clients/873855/File/91162733633.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf3b54a615---59832913926.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/74a46add269e7254a24fbaa486ca2b1d/1082392214.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/2bbb2d5a4026178f4835c43d8b52021c/85032829093.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091703285f03---17019248671.pdf
    • http://mppscstudy.com/admin/usercontent/file/gofemakimalibigekud.pdf
    • https://tavio.ru/files/file/zevimurelaburexeniledina.pdf
    • https://viboot.com/ckfinder/userfiles/files/54024608526.pdf
    • https://eltonltd.ru/sites/default/files/uploads/97390254273.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/jrvi26el1u33r13tadninl7k93/73704641496.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/peasfe08r1ep71n32asims9et1/92369568862.pdf
    • 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_off0000ebe1.bin
fca82f4b8d462ef0b4a97aff18227374130c7b8686360fd244ccc67fa545ed51
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 10200 bytes
font_01_sfnt_off000102b9.bin
8c8f9a3a9ca851f88396e18dce7362156cef877b5e56ba540fa6c991f450c47c
pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 17292 bytes
font_02_sfnt_off0001300a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1300A 16792 bytes