Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7baa8c4974b7640…

MALICIOUS

PDF

89.7 KB Created: 2021-07-13 15:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 116051aa24e7b67fe0daabd5132dbb7a SHA-1: 4bb0f4a9c21c395ceada5ee08f94610a80640a0d SHA-256: c7baa8c4974b7640741fd9274f98771c605cd24cc7996d8674f7b05dc9573a85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm to distribute phishing content or malware. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wastran.ru/uplcv?utm_term=trusting+god+through+disappointment
    • http://lacasedescaraibes.fr/file/98561376128.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f75f3ba723---24207791755.pdf
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/1415082fbbd8813940e916161e52e554/32174097388.pdf
    • http://medi-sen.com/files/files/bupezuforef.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/974912340d315b4d54e8a749c1011217/10457581791.pdf
    • http://qamsar.org/userfiles/files/zirudexipoxubafojubesori.pdf
    • https://kaptenhoki.net/contents//files/vabajuzukudaxor.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/4061b5ab7e4b1d7d16d6029fe32670c3/vevorunid.pdf
    • https://isleo.com/i_photos/file/solax.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b00ef35df61---bokodofapetojup.pdf
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/belekoxanuxowewen.pdf
    • https://global-product.org/CKEdit/upload/files/fuzabofadotamozatel.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091a0b7f201b---jesudu.pdf
    • https://zweefvlieg.net/userfiles/file/wenuxizukagavudafosuduk.pdf
    • http://immobilieninvestors.eu/userfiles/file/lukilotumilab.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4871291fb---gegasewuji.pdf
    • http://kristenpell.com/userfiles/files/logikokurafezurub.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160917073910f0---vurutigonupenowepa.pdf
    • http://gramercygrand.ru/files/file/beroni.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccb2737da1---mojene.pdf
    • https://alnahamgroup.com/userfiles/file/zonatuxixaridisubiranumoz.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607cce1fe5bb5---dagedakepumaga.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD36 16792 bytes
font_01_sfnt_off00011548.bin
fdc8b00f802163be23141be5beb75557ada19cd66c6c4b46b0f9130528024904
pdf-font-stream PDF embedded font (sfnt) at offset 0x11548 16932 bytes
font_02_sfnt_off000140f1.bin
e421df975f6beb8a098c3e1144812ee8165908cc42626e6b22eb43f729330ccd
pdf-font-stream PDF embedded font (sfnt) at offset 0x140F1 10856 bytes