Malicious PDF — malware analysis report

Static analysis result for SHA-256 20fbdd64d22eddfb…

MALICIOUS

PDF

86.7 KB Created: 2021-08-31 10:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 3b49f5af0a545d7da42fc81792378d4d SHA-1: 70edc61180d3efc1408d795f2e97cb30ab09ca8e SHA-256: 20fbdd64d22eddfbb6202f3660da85b48df6ef3278f45760d3f847c9376c1bb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous URLs hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF being identified as a phishing trojan. The embedded URLs are likely used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/26dbb1558f5386621b2b489a3967a32a/mepevugozigox.pdf In PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f948ed9a81---deragunadusugaxot.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/99785901723.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/1d338ea294274659515dbe9fcc76a0bd/tudite.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/modafefolisukojakanabo.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/18222967698.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/cd2ce29c2981745c2dfd32e3f518812d/9262335406.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/76518749675.pdfIn PDF document text
    • http://proxima-design.cz/files/file/85425865788.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/07846b729da78e0e569d46eb2f9c44e3/wisen.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160867c001729f---11940009888.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2df0319241---56724592756.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7f662729e---24773924832.pdfIn PDF document text
    • https://sanidom.pl/img/file/xujizupuzifexejezowagisap.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/jipinenudimizogujuminuvo.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/xemifogamajeruwaxupasadig.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609da8ee6e511---26151732649.pdfIn PDF document text
    • https://biocoils.com/img/file/98259606435.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/lujotetipemuwi.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/xugus.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/88522685584.pdfIn PDF document text
    • https://signika.pl/Upload/file/bawezupuzobunirunikujup.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160854e554bf62---84566872831.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/4669989139.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/bbe1fdb4bf2fd00c57527975b76eef4a/70021386625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=back+of+tongue+white+with+red+bumpsPDF 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_off0000eb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 18244 bytes
SHA-256: dfc5e706219e4505c646f4cba9af88d3b645281e29872f1fcce408f250f965b4
font_01_sfnt_off000119fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13214 11492 bytes
SHA-256: 46672bde5995dec39041e9451daddbaeae38e6de7cb1914516d8238ab252fdd2

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