Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b10b3162c7c6728…

MALICIOUS

PDF

89.8 KB Created: 2021-08-17 00:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dd0af49b1bc411bbce862d69266a3f82 SHA-1: a337672b6b17bc3ec98237dc0088be6d41128f6d SHA-256: 0b10b3162c7c6728c3e70e59d230615ffc6f6539d9f3609c17244f4ca1f6fe80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URIs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of embedded URIs and the overall structure point towards an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=shimano+altus+c10+manual PDF link annotation
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16078e183eafec---13533784136.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf10e5f2e3---28670416186.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/bewivapazaramonekud.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/86ejhiek6jmb1rjsr9l7nbdus7/75277924622.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/lakaleber.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/03dc68def6431d177892323531f00469/tuvegomapo.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/c09199ac9b396b9735f61b8be88bfb70/sunamizuganowerid.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/wizugepira.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/9612b2a280cde397123153233be0fd88/xetitasug.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fea74e146f5---87523592578.pdfIn PDF document text
    • http://labsshop.com/d/files/89999347993.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/nogewijuxijifubapekakewa.pdfIn PDF document text
    • https://kawanmto.com/contents//files/bufixelalorinudi.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/44216295168.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/23707461794.pdfIn PDF document text
    • http://ibb-online.ru/f/file/tovaberitexibi.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/dfa140ee1919d64b99d6794eed18a8eb/88003345327.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/ripejomili.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607651a6e5646---rosexebukiwanezuvox.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/lugelonaziwovororutijode.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/2237b792ad8f874910d1a9b15bc21c42/nokogurep.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/sedoloxopalij.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/27646718728.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/10d78219dc3cdbcc560e5f433f251b05/nibukumoxinijoj.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/70332162326.pdfIn PDF document text
    • 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_off0000facb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E2 10612 bytes
SHA-256: 002895f5667faed363c646767a71749b37c093e522dd4b94b9794438d596faf1
font_02_sfnt_off00012af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF6 17492 bytes
SHA-256: 624bfb92f8360b5709b6ea7d4964b637acb784b3c3f13c2c6ea46304294c6f9b

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