Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce61e52fbbe0497f…

MALICIOUS

PDF

83.3 KB Created: 2021-07-28 02:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c1fbe54b5a8315c286dd3a2c08c9323e SHA-1: 9fe77c08c8975c701012504852a2aefc0ea2cd5b SHA-256: ce61e52fbbe0497f35aa6d9b2d4db3d4ddc09b527809c100c669318cf5d8bdbb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of embedded links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of these links and the overall detection profile indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16076ae1147097---vuxudipavava.pdf In PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bacab21a1d---wubufadeza.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/3568972364.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/n8truuc6bba7u2qd0obfhe2m32/famasoranezuwumufibisi.pdfIn PDF document text
    • http://waltonjohnsonfamily.com/clients/870437/File/nawofo.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/274a4aed02d990443ce17b6dd9667047/novurizowuvepodi.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/kanemilekivelotiruji.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/93085526101.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/tilivadivuzodo.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/zolixezisizivumatoru.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/87778634558.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b42f440b271---fasifowanogosapogisedi.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/kobeganitigolasejuxoganex.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/b06f76e17aa7cd09befdd24400c57bf0/93929511219.pdfIn PDF document text
    • https://afayl.com/userfiles/file/gazase.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/d068d616847762afdd18de5ffbe51474/16653406071.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/midunegisevemiku.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f33309e8d1---xirefotad.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/71ee22804eeba54068ffb28e9d9bf56c/14477617453.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/vixogamiteb.pdfIn PDF document text
    • https://clubon.top/uploads/files/74322559587.pdfIn PDF document text
    • https://partner-support.net/user_data/userfiles/files/68089825589.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/vowelexuzes.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/nunulilisivojovel.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/felotomixo.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b54129020---sitegokimovilefuxomases.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=reference+letter+for+fulbright+scholarship+samplePDF 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_off0000e718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 11212 bytes
SHA-256: 5acda30d86783cb332a785c8b0e56383fad76d7f1b7b9cc3e82299db4c014fbb
font_02_sfnt_off0001190c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190C 15148 bytes
SHA-256: ae2191b56b9690330a2e28129cc0353b4e991dcedf3a1e8469ed763f682c4cda

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