Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9697626778f38fc…

MALICIOUS

PDF

71.1 KB Created: 2021-09-07 01:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8cd884c39d5ad097c9184970c3f6d95 SHA-1: 4b4bb753d9924d46f1b00eacd50e22802b0c8283 SHA-256: c9697626778f38fcd0d3d460336e654890c35156cb322f8b77665988069bb38e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://irlanc.ru/uplcv?utm_term=pampero+dumpling+car+seat+manual PDF link annotation
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/fe38550257a1f9aa27776ee08f941a40/19236794304.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/26232458514.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/38457734799.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/akgnn4s4p9kcpr3ukjlaj4impr/wapakuwagotaruzuwogumiz.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/36563975619.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/nosufipefofofilediw.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0710a8409---18711010697.pdfIn PDF document text
    • http://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/sawerixefejimepegojotugow.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/kabidapak.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ff5206ded---23655842027.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/nutukixepipejudejibuv.pdfIn PDF document text
    • https://loctra.net/userfiles/file/zesagotujidotovifademino.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e1ed894f6---lowemagopetunezononakopef.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/74678208638.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/tefenirekexejoni.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca981ee223---refufobenisen.pdfIn PDF document text
    • http://hydrem.ru/images/file/xevileb.pdfIn PDF document text
    • http://rubensova16.cz/files/file/88527989471.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/691245d7b7f524e6859335a8f0bd51c0/63014820402.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/5191296211.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607539762d567---1527123151.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b082c409ba7---xobivaloditataw.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d7ada9f7---mawetufeguka.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705ded649a5---jobubixawefesifol.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/231920591083.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/xovul.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_off0000b9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B8 14324 bytes
SHA-256: 4e7bd81bc3c0fdce04fb36adb59cf8aae1cb2891aade09cfa1478412c60920ce
font_01_sfnt_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 10960 bytes
SHA-256: d0ccdc32fb1f453feb98731d057ec4b33e54040df5ab066a41f09cd7d4f098ed
font_02_sfnt_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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