Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b41bad4be37d6a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 07:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7de64c82523435cff4aa8cf8a5c3715c SHA-1: 41d9d73cbf19438955713a598fda8b2e3c445d84 SHA-256: 36b41bad4be37d6a6d9e6ef553a81aec41dd9cb306c74c4822e555db86a611b3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, including those with UTM parameters, suggests an attempt to manipulate search engine rankings or distribute phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/1c5287b305150a3699337271e1830518/defigiwarilutogex.pdf In PDF document text
    • http://fratellibeninca.com/images/file/vuparekibidezolakaxuri.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/nebeludebenefasuvapowijes.pdfIn PDF document text
    • http://beliangka.com/contents//files/sobiwefadukutobelenuz.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/66476876756.pdfIn PDF document text
    • http://naturallymine-chicago.com/clients/867610/File/narisumojajoxexeginof.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/wumutoruluvozafogoxupiwox.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/390f7514a389c1cd46e2f984a440ef79/gapajevez.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/jetoviguk.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630586849.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/65952880072.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/tudixamirudo.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16121938866501---wenenugawuxiguxufujepako.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/89112245518.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/74722282686.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e13380c1852f673a039b65d94f8c317a/44762257876.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b4b7026dc---68095324365.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/vojulumetumebir.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/046250a5511c33e13bc7bbb43319f973/tadogusuna.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/a398a66f579259ca3980293b8ebf63e1/luzawo.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/lamobokuterogopavafidi.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/77475004180.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/54815077489.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/womakugezekeri.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/25197304767.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98960788972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=strausbourg+manor+quartz+westminster+chime+clock+manualPDF 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_off0000d99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B6 11376 bytes
SHA-256: 233d06316f2ac2f9b80c5f096430820e5d24be5a26e512c954189e4f1806d379
font_02_sfnt_off00010c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C16 17900 bytes
SHA-256: feccdde1fe3afc99d5c87db7c023779b6380d3b6d8b6c386dffc21809564d216

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