Malicious PDF — malware analysis report

Static analysis result for SHA-256 d694ed45025df31b…

MALICIOUS

PDF

82.5 KB Created: 2021-08-23 17:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa78c2be6c8ec33ccc6d55d639d2268d SHA-1: 94494172ac5d1f6afdee693d1e5f1c89ea15d069 SHA-256: d694ed45025df31b54b0aa0fb3fe525e2aa27c5528d91b011b05feeffeaa0626
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=can+you+wash+silk PDF link annotation
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbbb8abcc2---71603467546.pdfIn PDF document text
    • http://change4best.ru/upload/file/sosomodukarejeta.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/2c3psmka1k0h2atgdmdegp24sj/84129699253.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16077d854cf7fb---20379756526.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/cfac0f0a5ab1cf93995318b844d60701/35939732973.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/26643860779.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/32a22e94a24b148c0474136edd31ff8b/diluvozi.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609548c81b9e7---14215832285.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/93284174832.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82b96a9d64---86987567121.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/lafebitevusukanovuwej.pdfIn PDF document text
    • http://coatsofarms.com.au/ckfinder/userfiles/files/suxerevanoxufevibigapufe.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084db1b710e5---zumubev.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/72643366316.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f075ee2038---60239309090.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608828040797e---lizudewakewajob.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf21cccf58---4391646169.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/tuwidivenitoturupopitajam.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/98400414494.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/52553191212.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/fb8c2f3bf1e78be68d7705124f26ff7e/pefafewaxuzotoveve.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/vigejojalune.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/5057b0178a01c47282b647ff58a218ee/podupesilejipuxunali.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/wopetofavutigugene.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_off0000dff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 17072 bytes
SHA-256: 7bd5ee2c7db33ad24a533c5df3044e0366cfa56fe056149dc76056c45f634bb4
font_01_sfnt_off00010c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C35 10300 bytes
SHA-256: 102b6507bbd4397af254bd30bb0e73eb8c22fd934ccf2dd24c5bb9dec2507f76
font_02_sfnt_off0001235d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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