Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3804fa35899f579…

MALICIOUS

PDF

76.1 KB Created: 2021-09-19 01:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 104d62c8be79b58441401cbc243dd780 SHA-1: 46d1763ed25ca04c8ec8e43604e378a269e8325c SHA-256: e3804fa35899f57987367fa0d1b1f2a0b33db5c0381a334fe49b1f176a9a1d95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with high-confidence heuristics indicating it's a link farm on disposable hosting and points to compromised CMS uploads. The embedded URLs, such as 'https://synerhu.ru/uplcv?utm_term=geronimo+stilton+the+quest+for+paradise+pdf+download', likely serve as lures to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=geronimo+stilton+the+quest+for+paradise+pdf+download PDF link annotation
    • http://driver-jazda.pl/upload/file/24560586902.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-6/20210906130333742364.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/20642031809.pdfIn PDF document text
    • https://digireg.org/upload/togipobisasuxak.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/silufawepelo.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/17247360407.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/jixikenepuvanepijuti.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/forapisof.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/3110909366142e340327a2.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/kutiwabovotixamolumokedi.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/25793158581.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///viwokolusagam.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/nukuxewezetegodezaxadi.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/kabajax.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/nuwam.pdfIn PDF document text
    • https://dm288.com/slicice/file/94899455362.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/gobawo.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53094cbb4---jaburewakepegupotazijex.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/64449276138.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/greog2ickintc9hvcpo54lc2ls/pagemuparenobawibet.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/xuminizugew.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/satoxativimo.pdfIn PDF document text
    • http://sartor.ru/upload/files/26712151745.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/foribinavatipilamedigav.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161404842811ba---2413099552.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_off0000c3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBED 17180 bytes
SHA-256: d2f8e9373f5738b5676cdc3d1d74544e1b8b318704c52061a8885d6575413bab
font_02_sfnt_off000108ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CE 11136 bytes
SHA-256: c7ff6add4c91181e4bd9f67a89c770dcb7440bf05d85c67d58045073fe780f0b

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