Malicious PDF — malware analysis report

Static analysis result for SHA-256 a587ed441f3d2c62…

MALICIOUS

PDF

80.7 KB Created: 2021-07-07 01:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17e48177523475a91f5b8b5a0a8221c6 SHA-1: c4b257328ad3fc0433d8f3a1317bcecf777f1a77 SHA-256: a587ed441f3d2c6255a796627a0241fa4f2b6d45b3c610081e943942e33e8ef8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is unreadable, but the presence of numerous external links and the nature of the heuristics indicate a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d55a01be224---91842243530.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/177ce6f207623f32de5f97bb2318dbd9/35096974477.pdf
    • http://www.firengo.com/userfiles/files/rudodulotebipipok.pdf
    • http://podlahypilat.cz/admin/file/43206290188.pdf
    • http://pwmtqatar.net/userfiles/file/sibifelukef.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/c096345bbe364327bb65e08a92e5b270/vununigajamigera.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//vogufanesenesufexotuxixa.pdf
    • http://pokewaveanaheim.com/uploads/files/5911801693.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/61d0352f4f0f3b84a11949a6750c8593/52894179158.pdf
    • https://topplene.com/upload/ckfinder_temp/files/20210704025251.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/43cac1e08752f98c653ca56525e64133/30349641186.pdf
    • http://zge-led.com/luodan/images/userfiles/file/bepoduberikemaxajadodi.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7f176a346---65007738523.pdf
    • http://amirafouad.com/uploaded_files/file/romokinozolikujalom.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1f6683469---vopapabarawewamiw.pdf
    • http://mousike.it/img_ins/files/senov.pdf
    • http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/jolejenatixi.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/e8c1d0fe44f6eb933e916a0be6248685/rojunoxinu.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/o0tc7nch7ah4eq6amofd1cppm6/53761565693.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e62b4a263d---fuzobevifeseduguze.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/878c28d6da2162b3f4b96863e1552fb8/gijugunugabemejef.pdf
    • http://zuche0551.com/upload/file/gusilusimevowunib.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=aieee+2005+question+paper+with+solutions+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_off0000d5b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B8 16792 bytes
font_01_sfnt_off0000edcf.bin
fdaf704ed7a772818f7f2dcf516b6480b988eab520943cea5011bc4ba788ef80
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 11284 bytes
font_02_sfnt_off00010836.bin
94325c0b5269075b53cba53acf0ed21b964a4b41ab6ab35a8e3416f838a97585
pdf-font-stream PDF embedded font (sfnt) at offset 0x10836 16628 bytes