Malicious PDF — malware analysis report

Static analysis result for SHA-256 79456b0687261508…

MALICIOUS

PDF

89.5 KB Created: 2021-07-28 05:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 50f0519547347cda419c7b3c607fb154 SHA-1: 010da50e1393cd6d07eb1a7d0ecc1c1d288be46b SHA-256: 79456b06872615085cf985989406cabb812c31806c8a7d7e4e6379e0412bb1b8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate these are part of a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers confirm the malicious nature of the PDF, identifying it as a phishing or trojan variant. The primary attack pattern involves tricking users into clicking these links, leading to potential credential theft or further malware infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://argentum.com/wp-content/plugins/super-forms/uploads/php/files/dfft28gtfh4a5h0dr5s5bspg31/38077907443.pdf In PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/nogegu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801bd30c020---24910494881.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/0ae603bf387b8f75ae00e65e86e874e6/mazilowel.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/26866136100.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa2d5425692---952479908.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/jofirivuvenavobafubaket.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/42659032367.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f057a5fea---sozekipaxifufawojarop.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/696ksfrgir5abb4vsi2hf034gc/38907516596.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/kv97vo6ninceevem28u0u6qrug/mukafe.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/jatonujilo.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079873022d1e---27876730682.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/3604898293.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/c86b3916c78bce81e9aaf73ef858523c/texulosadavudes.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf46f11653---goviredarovawero.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/0a7b41b723b0bfb0385cc0ab6a441a4f/92137761334.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/2548538d8e40122e5242068e62a53a67/43414745899.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/466ff96d6e3640917e47f774cd1bab52/kupupuwemagekedabi.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8b4468a9e---ponifanedigepisijufikuzo.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/wudorojazuk.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766fb6ca45f---pimefotatog.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/libojadigaxenipe.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/63628787471.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/zivimusofefubefepofajij.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/retomokevagopubesogetasu.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/62526963163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=la+se%C3%B1ora+fazilet+y+sus+hijas+final+segunda+temporadaPDF 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_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B82 11512 bytes
SHA-256: 3bb1c5feeab7beed41835438ab39b551ab662b34f9301fc79a0cab111905f2b0
font_02_sfnt_off00012620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12620 18916 bytes
SHA-256: f2c9d9324197cc19bae656263c2b19b24c4be6c22b9715e81bd627df27d9acac

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