Malicious PDF — malware analysis report

Static analysis result for SHA-256 835abb303f4ca102…

MALICIOUS

PDF

92.8 KB Created: 2021-06-26 03:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dcd624809444ead1720c53e1a96aa72f SHA-1: bea778e74ecafe9d57140db27e71b499f907a3ba SHA-256: 835abb303f4ca102788240c8b62552224bc6d760cd631470d4e73f48dfc06a22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting domains. The presence of numerous PDF links and the use of compromised CMS upload storage suggest an attempt to distribute malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://crosswaysrecruitment.com/userfiles/file/remojonabodoku.pdf In PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073f6d0ef0ce---pekamag.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/2obqn09hce7vu26b213fun4qdf/rezowokoxadosubefikeziru.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/potofepulagolu.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/rarumafogepulelinudazoda.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/98646605298.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/kobotozilivofavibizu.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/d9dd9f7ako06g87ji7alb35bab/70258920137.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2efa64ea1---10542504909.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabd1f554ed---71109415106.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c568b0b4285---46796514457.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096c7cf091a6---66503807325.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/4d0qb2e445og9bm9o70acrv6pa/powiwoduwatim.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/53043831866.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/14894008671.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/33464098231.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/8d41d18c51c74a2c427209384b77f5ba/fekinimulegonenalelabixit.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/fa1431e4ef5d20921e31dc8ba15f1721/wawarisedotaxo.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093e86288a0e---40297013614.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/54848124635.pdfIn PDF document text
    • https://zold-kommando.hu/files/4115987168.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/sp1hfg3er349ec500feegd8svq/32629662851.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b34b68d789---51247025629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=umba+sapphire+meaningPDF 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_off00010932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10932 10584 bytes
SHA-256: 88233729e0baf0a2409e230aa3ba7a4cc715ceb4b4908f9bc19c0d5b9f3da1f7
font_01_sfnt_off000120e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 17272 bytes
SHA-256: 054860b2a74d05b23e29af786843f075e2965d8565f1aabbb26fc9ee25dd3a19
font_02_sfnt_off00014dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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