Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b929b99c6f595c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 15:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 04f81ac44870b41dccb77644431384ab SHA-1: cda89caee1e3879bba95abd7b8b0f51f9fdc9c55 SHA-256: b7b929b99c6f595c8518f3028543590140a81ba3d8dc369cf9e8c88cf47c627b
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on disposable domains, a common tactic for distributing malware. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method to bypass gateway security. ClamAV also detected this file as a phishing trojan. No scripts were extracted, but the overall structure suggests a phishing lure designed to trick users into downloading and decrypting a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://bawaniint.com/ckfinder/userfiles/files/6751003560.pdf In PDF document text
    • https://krossi.ru/images/content/files/43150137069.pdfIn PDF document text
    • http://spbi.cz/res/file/fenikowogugovasefupu.pdfIn PDF document text
    • http://livestocktool.com/d/files/73290462566.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/koxavomaxuduzujaginina.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/retexibetaki.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/nujeduziligizotelu.pdfIn PDF document text
    • http://ergakiland.ru/files/files/98110183345.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a944bd0453---39043071207.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/voxijagedopijewo.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/vamekira.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210912234815.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161392b11abf27---zozolumalogovexixi.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/xoxibilejudexitesuxe.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/popijekukeguvirumifake.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/77575473839.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/6902686098.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/49297776052.pdfIn PDF document text
    • http://klaaswester.nl/img/file/banebutepevelafabev.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b17dc1ab1d---76175525633.pdfIn PDF document text
    • http://techmechengineers.com/uploads/86007306110.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/botirimoniwibir.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132e863db220---28729577969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=pegasus+qr+codePDF 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_off0000dee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE8 17744 bytes
SHA-256: f07bfa9fbfdce42437a8d1877a175fd444039d53c099891702008a14943c05ac
font_01_sfnt_off00010d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001254a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254A 10452 bytes
SHA-256: 07c335beb5eb1b29dec942b490dbe488e993b2589dce0eaa7c4581cef8e8acda

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