Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd359c01e9a1c5af…

MALICIOUS

PDF

84.8 KB Created: 2021-09-21 11:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 43bd3f84d81512ed2aab3ae42906405d SHA-1: ac680200879bdebcd05ae53de85ccc8a7c2a5624 SHA-256: fd359c01e9a1c5afc3459530570225f154dab7183d736bae73b398e4c61ae1cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to obscure the final destination. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. While no scripts were directly extracted, the structure and heuristic firings suggest it's intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://alnadaoil.com/userfiles/file/wumozanaxujurige.pdf In PDF document text
    • https://chingchia.com/uploads/files/202109101403288800.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/62817234370.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/24019317161.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/mowuligigonerediguxe.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/62708308863.pdfIn PDF document text
    • http://bdsductri.com/upload/files/zolalisufarojanazubab.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/bomegusotijoj.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/12125544226.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/50316042594.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210904081226.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/sawivinokowup.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/xezedokudetulifi.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/lamokezitelebotaxexevag.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/xotafexunukukut.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161368256143a7---zuwoluwol.pdfIn PDF document text
    • http://asvpp.fr/pdf/wapejuk.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/22428607925.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/legodadorozigijowoni.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/581761161.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/40071487754.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/a1e86ceadf715cea1ad5ca5165cdeb5b/zunarazevejowig.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/mugewedez.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a8c9003dd---kowodobuwotavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=add+wait+to+phone+number+androidPDF 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_off0000e75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75C 17620 bytes
SHA-256: 7da80347ab0f6862b56000341d056c2b05ccf732e2bb9ddab75dc9c9376743d9
font_01_sfnt_off0001156f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156F 10748 bytes
SHA-256: 6caf924a88aedbcb47853b352343f93e7d302541c9f0131a9d9d3bd42c491b11
font_02_sfnt_off00012dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1