Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91a4afcc8cac0cc…

MALICIOUS

PDF

88.8 KB Created: 2021-08-13 11:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4dc71b0fd2d2474911b5cbfffcc13c59 SHA-1: d283acea95f561cd4e82d9712c074714975edc5c SHA-256: d91a4afcc8cac0ccff58efccd5c1968012b8e401143c1289a4b77717e4c51ed1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'SE_URGENCY_LURE' indicates the document likely contains text designed to prompt immediate action, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cowichanseniors.ca/userfiles/file/mijobaxu.pdf In PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/boxepadexusewanifosanoxi.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/1971937149.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b8d57857c---72269014378.pdfIn PDF document text
    • https://grandegroup.net/files/zubofarotajamenilim.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/9nlem93tcofpfn8khpbodrk927/puwakibebivonoxaf.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a117721c6fc---mimikikotox.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/55720199378.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/vuwotulol.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715fc52f072---gezinixili.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c28b28849d4---fedugigamemuguvozoxok.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/4vvjtei203nhao5o7lo8e0str2/67404816440.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/gikoroxipadekusabanitezek.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/c5ac1fe789177dd2b6ebb3b3c3310eb8/90603255656.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/pokix.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/80n0rd2fbge84ik0si5pqr25h6/37332302328.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/02888fd1fe82b66c4adf04b89a0f105f/munusedidelapibipiwiwurik.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/87456123345.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/sefewivimeluba.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/f7b86b3f6433a34c0fa44fcaf713fa75/dejixanoraximemitevako.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/5cc7f6a87a984a9709e33299f905977a/zukerajazijibexapaf.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/53258725310.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/94352533646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+read+a+drug+test+lab+reportPDF 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_off0000f666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF666 10688 bytes
SHA-256: 20c93204e1b2f0a7a668cccff77de5c444447327b1b55242554162821967a0b9
font_01_sfnt_off00010ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA9 17472 bytes
SHA-256: eecf47ffa80f1a66bb09d5b45687a30cfa203ce5cb9f9640ab5495f7629ae20e
font_02_sfnt_off00013ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1