Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f6c53cd21e8996…

MALICIOUS

PDF

84.9 KB Created: 2021-07-08 00:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 475c0fe17557c850c43e2b3111da3108 SHA-1: cd170d0121fc51b54a7ed4a79e63bd96affa154e SHA-256: 27f6c53cd21e899630da3d19c29927fc9afdd1271940c4ee80788484f769ac8d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b6211178a6f---seritovav.pdf
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/uvmjgj2aqn8gr0ill4jhrr9ct4/takuwejuzirusapujopiwem.pdf
    • http://bartuceviri.com/userfiles/file/93169183068.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/83719d69c8c658865d40adaa1ee59649/jisinofaponusaxaf.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/e43344ca40e1688fe1a5f608de60e450/52261058965.pdf
    • http://alimentosldm.com/userfiles/file/47159314715.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfab5c3598---26927805942.pdf
    • https://sardavetri.it/userfiles/file/59920680165.pdf
    • http://enjoy.sk/editor_uploads/system/files/25965852734.pdf
    • http://autofactory-jin.com/js/upload/files/nezokozabarimam.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efd6121e4b---84981475538.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160747b877f30f---nonezenapuredatafadufek.pdf
    • http://boschvietnam.vn/files/usersfiles/files/72145593069.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b902671c2---dafogititapepiravib.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609692c1a281a---49002946749.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/e7ae0bf98f10bd6338220f147d354cdc/3914188155.pdf
    • http://studiosantese.eu/userfiles/files/zadinazipatewabobepe.pdf
    • http://sieuthivatlieuhoanthien.com/upload/files/61073941067.pdf
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/nevanudojulokasizej.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16071365e5743c---78554901098.pdf
    • https://shellserva.nl/docs/Image/file/47772375327.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/effb470f58fcc27e0095a6e9e06b7014/sozaxi.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c92e007875b---93738892844.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a54bdcab463---xiwikogekasebagikibigeva.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/f7135486acc1c7f9db1a3ac483b65c67/62604287572.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/2c7963032033d1a5d3c5c3a88c9b8d3e/54234463589.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=man+cant+ejaculate
    • 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_off0000ee51.bin
710e15ce4aa2683c660068021c5829184b3f3e54320cc351b6bd4ca0e7aa192c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 16216 bytes
font_01_sfnt_off00011831.bin
5b976981a83b210e1bbb1d7c01c95868bdbfd34eefc2620299c5ad8beb361b8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11831 9964 bytes
font_02_sfnt_off00012e6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6B 16792 bytes