Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4344aa13320d5da…

MALICIOUS

PDF

121.0 KB Created: 2021-09-07 07:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d8fba3dec87dbdbc3f5b6e5e2f27f4c4 SHA-1: 861aad99230c5a130ead650c26bdfe1d2fb76c30 SHA-256: c4344aa13320d5da293512cdbfbbf579f2b477662f1fe0fac9ae66f63243c0ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://inwebjor.ru/uplcv?utm_term=financial+accounting+valix+2016+solution+manual+pdf PDF link annotation
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/6f208841b78ef31911234f6d60ec55f1/40878793212.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffbed021b2---vumixosefotilop.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/81359451090.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/d19c7fd13dbc1389757a5d53f821a481/poworelazexalidevoj.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/0c6fc7a324640af6c7eccbf526f3a27b/99754276310.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160826fcf7ff00---52469917333.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610a621aad354---96526717382.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/lazeni.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/jawogobivubegokemexa.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/nufeketola.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/55455663682.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/7b01f87a74a245eb1db76e3c5bad4e6f/2653768308.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7230e8111b---rufuparig.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c8610ecdb---84228920710.pdfIn PDF document text
    • https://faprosid.com/file/22881138160.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/d08efe3baa94a81e6659528dfa5d303b/wonojumaguzakemitenumekab.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/57013564243.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/f3a33274c40ca31a691bbdfbdf1bb222/wamutiwikuxowaxup.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210630162503473739.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/bixuterarejusawez.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/28862ee8a5c4d21e5c5852e9c9e54bf7/saxifewo.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/31ea26a6eac7eefc5ee3a7b8a8def9e5/22648959828.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/ledutagi.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/75114007313.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/j87886bllv1r1tr3f5mabl57n7/xisegurolox.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_off000172f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172F2 18552 bytes
SHA-256: 2ffe72c18bb132e8fd8e0938a1756c276213a9ad0e9db78c8eda74c2b6ec79a4
font_01_sfnt_off0001a262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A262 11436 bytes
SHA-256: 950906f7a587665e499d77c1cdedc2d8b2c0366a191ec48c43a7835c6010bd53
font_02_sfnt_off0001bd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1