Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd606494c993a1ed…

MALICIOUS

PDF

95.8 KB Created: 2021-09-07 10:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 44cad4d19364d7197fb79105fbfe791a SHA-1: 53433304fd484f9abe798763771cc075828b6d2a SHA-256: cd606494c993a1edd080f1cf6ecf4d3f629d525973a2408e01c5857f588ac8ad
196 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs users to open a password-protected archive, a common tactic to bypass gateway scanning. Numerous embedded URLs point to potentially compromised websites, suggesting an attempt to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://improntediteatro.it/userfiles/files/nirijovudekabowafe.pdf In PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160756e146a6c7---61850976719.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/wuxajisolikazudiba.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/31266115712.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/18869229048.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607babe159deb---9079333095.pdfIn PDF document text
    • http://unseretochter.ch/images/file/lutafomudutujeven.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/rinuroxubanagosige.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/kewonegezokuzebuxovu.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/zurorobuxavileto.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/wadikapotelasejepefobivez.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/dda1e44276bb6dcf63b01349fbd6e25e/sorokabuzevazoj.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/fugix.pdfIn PDF document text
    • http://nicosiacaffe.it/file/kawegojirodavugixeva.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e09abc23e6---fowujixikaraxudazisojukir.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a85d9b089---satogosugi.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/998449d4f1ba8a7bf7e38b59dc13db8d/22348599860.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/zoxivinetizigexizoxakun.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/88688621034.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/2304834174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=wkhtmltopdf+ubuntu+19.04PDF 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_off00010a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3E 20308 bytes
SHA-256: 0b6da257cf0a53722a0ca77138d644670fad72ac8681d36900d7f4887dbe7980
font_01_sfnt_off000140ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000158c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158C4 10920 bytes
SHA-256: 43b3a9cecff55c32d5c9b138c0d36fcfde63b1ef37c9f9b276714722b868564e

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