Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7032c5266d251d2…

MALICIOUS

PDF

68.5 KB Created: 2021-10-02 14:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b651108de259ed9e96ca30adbc0ef3a4 SHA-1: f5927d9581ae7080ebf51ec98ddd474eb69f964c SHA-256: f7032c5266d251d2ff2c19e7e14a7a06509eac0c6370877b68ed9029907a35de
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external links. Heuristics indicate it's a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and link farm behavior strongly suggest it's designed to facilitate the download or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://lexcyberia.com/userfiles/files/pumupuxipokufa.pdf In PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/83847512630.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/bemijunep.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/korunudesalosimegakebej.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148ad5359a51---kemuted.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/zusapa.pdfIn PDF document text
    • http://anton-joyeros.shopcloud.es/ckfinder/userfiles/files/jodasenured.pdfIn PDF document text
    • http://llux.vn/uploads/files/xazapukewugixalenofixoj.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/gomupewekuvaku.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/japuliwinekivomi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6ea6216cc0551f5d70fa46bddc0b4957/14445221526.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210913_799E9981500F6012.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/nukow.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/dabatedigabo.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/4d1b899bccd35b31ee3946fa1d9cb868/10138868869.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459cf20a01d---vilibulolune.pdfIn PDF document text
    • http://jessica.yelivery.com/cote_dor_import/admin/ckfinder/userfiles/files/19282396093.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/10725542611.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/vajolamirujemuka.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/irhpgtg938mrj8n4k7houfvnvv/95798979123.pdfIn PDF document text
    • http://abwessex.com/uploads/files/jifapuratexologela.pdfIn PDF document text
    • http://metroboxservices.com/upload/ckimage/files/7277613097.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/mevibijimitamaxomamedix.pdfIn PDF document text
    • http://dmkert.hu/files/file/samukovizigeti.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/rujewutavenejejinogipevuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=woocommerce+guest+checkoutPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB139 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94B 14192 bytes
SHA-256: cbe652242feb12e41e155b8d230a7b58bb7f1dcec551cf5b48d65b4e0b169ecb
font_02_sfnt_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 10460 bytes
SHA-256: 283ce430849c7edc27051ded79eb699ce5f5ef54acf5a78fb036dbef6ca04c3c