Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7131361a97b9663…

MALICIOUS

PDF

74.8 KB Created: 2021-06-29 00:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa94e0877c61d8f40832b98422e59432 SHA-1: 9bfda367d94c25881aa7ae987ff0f8fd2f4795fc SHA-256: b7131361a97b96636ac8903f3e369d246ef23d028c89aa27453f1194f4dd8895
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm patterns, indicating an attempt to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to exploit user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://coretry.ru/uplcv?utm_term=general+public+services+examples
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/95d7ccc31e1c0776774f15e0e2146520/76310176220.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaf9068652---pazup.pdf
    • http://www.yoko-ono.be/images/userfiles/file/40627819557.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbe2974a05---gafogivaxewixixa.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/a5eefd6ca7dc9ee62a55048856a04734/rarir.pdf
    • https://murtenhof.ch/userfiles/files/vuvivasubipet.pdf
    • http://wonsakai.com/uploads/files/rudonikejupokofo.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/55202285970.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c92b88cee---77167327925.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080d6cb1dc8d---rosakobimemedomunubaxo.pdf
    • https://gbagencement.fr/uploads/file/bubobuvezajid.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/zivenosenal.pdf
    • http://elite-nails.pl/Upload/file/rulowevuwerawotopi.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b725b8d4e0b---34535990896.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/q96c8jbkr9oqjkof1b2rb5dv67/51108235535.pdf
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/10251670678.pdf
    • http://olgapolyakova.com/files/files/gozelelojetesaxotazur.pdf
    • https://kcharp.com/ckfinder/userfiles/files/mafarefires.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076c45e62b68---bujogad.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/3f8d889b6f1e64e482e2d3b584f1f509/kipakizukagube.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86933a9bc4---rebinomudusapa.pdf
    • http://www.look4job.gr/images/_user_na/file/bipiwezumizakeb.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a745fb8d177---96894573824.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609827c8e5bb8---solamesekigojuterem.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098338e82167---73110238921.pdf
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/numizonurivina.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_off0000c38a.bin
84e389b018012d7ecf5f7e8b938b4a40c9e7e164b30d220a424f4fb5445215f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC38A 16076 bytes
font_01_sfnt_off0000ed04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 16792 bytes
font_02_sfnt_off0001051b.bin
f100e075dfd60db589c93661004d6ee3cb5d5e2970260327ea1cc1897116d692
pdf-font-stream PDF embedded font (sfnt) at offset 0x1051B 10764 bytes