Malicious PDF — malware analysis report

Static analysis result for SHA-256 59756cf86f6c6875…

MALICIOUS

PDF

90.5 KB Created: 2021-07-02 00:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49674126cd101946d1b53422542d61b8 SHA-1: 2a7a008307acc025b2be0103718fa4b0e96ac300 SHA-256: 59756cf86f6c6875e0e373f6db75865432f037f418f3211e86f77c14a540c6cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting it's designed to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=my+talking+tom+friends+download+for+pc
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607445f58b90a---gutekixedekuzufas.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/47116773593.pdf
    • http://fujavietnam.com/images/Download/26159846977.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/edac43e5f2704f4f1bbc065f63c1f715/somazilirotasekujaseguje.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608119ebca3ce---kezoxakagesokukadif.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc722063850---zumori.pdf
    • http://alltechsro.cz/files/99385929924.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080d511adc6f---jipopenisugabenorerom.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d32904215c2---12310768792.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/2b28899d9f31b4b95e09ce4b9a54d209/14178740649.pdf
    • https://afra24.com/basefile/afra24/files/laderezowalifixozu.pdf
    • http://katachizu.com/img/news/files/vuvejisazeromi.pdf
    • http://pphu-joanna.pl/fckpliki/file/19291401789.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/fcdc9aef9537ed4e3d40bd04ab772f62/50697070570.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16080fd226a3cf---13165469501.pdf
    • https://go2germany.ru/files/file/76118098279.pdf
    • http://www.bluewhaleline.com/image/upload/File/57984297511.pdf
    • http://0-50.ru/userfiles/file/89052564605.pdf
    • http://medicaldistri.com/ckfinder_files/files/54937401217.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kngove05kieeb39qncr15v0ht6/55914376789.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b68d71e670---sowijekuralemarazogisaxi.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/pedoluvelaraxivumid.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf783d3850---16685419355.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a6723ca4db03aeb733a0736c63b50a01/81595206140.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_off0000f040.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 16792 bytes
font_01_sfnt_off00010852.bin
77621ef32f2c22b21324862408e77c138d1eaa85c58cc5b254870b0ef3fc873d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 27100 bytes
font_02_sfnt_off0001408b.bin
8655a22dd099c835681775f0b1684fde360536179609be7d630e9a9e9d16fc46
pdf-font-stream PDF embedded font (sfnt) at offset 0x1408B 11248 bytes