Malicious PDF — malware analysis report

Static analysis result for SHA-256 eddb4fa6cd32f747…

MALICIOUS

PDF

97.5 KB Created: 2021-06-26 01:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1e58cc05c05adc2024418230ca6e4d5 SHA-1: 78b4e851fcf4d4203d68292fc3f7c580289e4366 SHA-256: eddb4fa6cd32f747c96984b0a2c26190aab3167b706791c7decc6052704f3aa5
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically related to phishing or malware distribution. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support the phishing lure hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1cbe48f28---57391438101.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/1b8a7cd4436492dfa865b2c56434da3f/taneziputenadunepelidurov.pdf
    • https://mangonebike.com/uploads/file/rarugipaxeno.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/9596tmlamiug76lq3ov1934eo7/16777082555.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/5hctl6kbghqjjdqumam2lu8jj0/pubupidemekusatubewanun.pdf
    • http://aps-mes.com/files/file/koritawuletakiruke.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070cec757ec1---14588674226.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/4cd82f964cd536bfda53fe9bc59d189c/jewixafezufisewa.pdf
    • https://xosobacninh.vn/webroot/img/files/2196480032.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/4c4ab2b47eb8fe59d050a1d8d2abffca/76874950261.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160ce992643890---sokiwafito.pdf
    • https://rpitrade.com/ckfinder/userfiles/files/kogapirerulasale.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087683c38050---337461417.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a191da3f8e608e289483e824211f927b/fazekibudupisebijidi.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3fff3e7c3---pufalakevepatavobavibax.pdf
    • http://studiolauramoschini.it/userfiles/files/xekezavowegewamamiku.pdf
    • https://hostingalani.com/calisma2/files/uploads/jufafumexididosixi.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/88780b03c3ab7d9e8c9aa52451972877/masufudidujilineboj.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbf665d618---21463107302.pdf
    • https://angkortaxiservice.com/userfiles/file/82404144663.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/f8759e99ec3882b2135347823b843612/64549068603.pdf
    • http://ibb-online.ru/f/file/25708386270.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=title+17+copyright
    • 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_off00011d75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D75 16792 bytes
font_01_sfnt_off00013587.bin
3fee7ad211bc02d81804178748db075bdca5936965a72f9df74548ff41e1b37f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13587 16352 bytes
font_02_sfnt_off00015fd2.bin
75e9c26fb304b4d18aff18773d5ef20ef7650ddb0a0e6af67e4bb40e6af6c9c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD2 10400 bytes