Malicious PDF — malware analysis report

Static analysis result for SHA-256 159f476713670cd4…

MALICIOUS

PDF

88.0 KB Created: 2021-08-01 01:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 307c4904695d367df9a39e83f1915b24 SHA-1: efb62616758e0114f6aaed627c85a3cee5ee7590 SHA-256: 159f476713670cd4bcbabca8acb47657c80a5aeed5119c45aa38cfa40b6213e6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing lure. The heuristic 'SE_MFA_LURE' indicates the document is designed to trick users into approving multi-factor authentication prompts or entering one-time codes, a common tactic for credential harvesting. The presence of numerous external links, many pointing to compromised CMS uploads or disposable hosting, further supports the phishing and credential harvesting intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.toptehnik.si/images/8664296891.pdf In PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/nikozijilewilixogaz.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/e36dc6a4e2293901323d2175d2d1fb07/fefibaxumokumiwi.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/30721481198.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fe997eae6---lifipepavaloguxuda.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/tutajulijuwukekokolinasad.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609636654519a---1181869393.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/6chk1f0s1jq311a8h24j2frdjt/nekefabemewafavorapupetaw.pdfIn PDF document text
    • http://elijasprojekts.lvfiles/file/10584493397.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/6278360989.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855fa52994c---51983990737.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a44b6f0a95e---15695996440.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/mosufawedopunumutoko.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/5efb13a7410d74194e4291a27384de2b/bixekotadiwun.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/jodenegolulebirexadixol.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/93264c675125090f3921b340718bc9b4/libizefi.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c49400e2db1---vavakitopasixe.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/73712646529.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/4a4192ae4a6a6db661a6cb35a191022c/mevazifubewejojepawikaw.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/37766190156.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/dvt1pgl5ai90cdfud67g4eiift/74071659555.pdfIn PDF document text
    • http://luatsubienhoa.com/upload/ck/files/46528284413.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ecf100d82---38534458795.pdfIn PDF document text
    • http://inse.us/uploads/images//files/46023861650.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=twitter+verified+logo+copy+and+pastePDF 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_off0000f226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 17684 bytes
SHA-256: 1d6008e0d223d46c05cc97c73946bae1ded428c23554fe839975a930e18fb489
font_02_sfnt_off00013856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13856 11024 bytes
SHA-256: 220f190f76e9488489d1fa4d6494773f5b8ef46d6cc1fbb2cd3215afb654d9eb

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