Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f216bb9aa318c5…

MALICIOUS

PDF

80.3 KB Created: 2021-06-27 03:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 601594c577881a7848b27ac7b17da07a SHA-1: 2146a10c58cb8514f1ecae64ec27879e0901bbb0 SHA-256: 59f216bb9aa318c5185ed0330066cb8972acee8265fe68f07102353b6d52f1d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF sample was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites, likely intended to lure users into clicking malicious links. The presence of invoice or payment language further suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/0db065f565764f9aa20c0ef9d45c68b5/28513734859.pdf
    • http://albino-pitti.com/pub_img/file/79020988630.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/74269260971.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/4413546949.pdf
    • http://coumert.com/images/file/14940305207.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aca03f67c29---63368279146.pdf
    • http://ropesadventure.com/d/files/xagitusuberugijukaxaxoz.pdf
    • https://andrejc.si/files/file/94392970473.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/7f900d1d8c91b1787011d74bf9a2b09b/darezifazafunipurebivam.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16090d941314bd---76164065106.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a300109fbc2---vijarevozixenubuto.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160be364457a49---setimasexizosamore.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ce2726721bb353645c8fb3e92733711e/gabevagedamitojev.pdf
    • https://tonitomov.com/picture/file/poxonaleboxu.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/87079465265.pdf
    • http://kaies.cn/upfiles/file/33787023983.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9a8a793f4---20717186526.pdf
    • http://wisdomtours.net/upload/file/wilarifimiworudipagevamu.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/360d82f1ac19f19bc7ed5ced974f9e97/76084757441.pdf
    • http://tpdw.pl/userfiles/file/58226476247.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804e88c6bab---23565155958.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/1a41a9bfcaf128830ce8673e2ba09d2c/fomorigimokugejususu.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/8be5esalc7756feo9dljo0kr33/pimejujifimapi.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b858371b284---12749495145.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1il1pd9r69eldb55mf25cj2grb/41208217348.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sony+playstation+2+component+cable
    • 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_off0000d445.bin
9f5d3d83edaa3413680e3cade964f0e33576318dffbac85ed117a51b29e3d7ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xD445 10884 bytes
font_01_sfnt_off0000ed4d.bin
54a8191601ded6bf48fbf1aef34a2222905e6d274acf9eb675493a52334ae748
pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 17564 bytes
font_02_sfnt_off00011bae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAE 16792 bytes