Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdfee0a83160d5d…

MALICIOUS

PDF

99.9 KB Created: 2021-06-29 16:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ed56fe7cd10beea6e8eeb7f3a64aff34 SHA-1: 570e6f196ce103aa1044c309cc40040ddcd24750 SHA-256: 7bdfee0a83160d5d89e129270a47d38f1361567b277e7f236c591a05f868543a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and utilize UTM parameters, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the overall structure and URL patterns are consistent with a link farm used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://crewmak.ru/uplcv?utm_term=rumi+darkness+quotes PDF link annotation
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da7a8e343d0---jifabopuz.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/kasaduneguze.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/r721osko3as3e1gdpd374u90v7/44018378458.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/kolopirumu.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fc2298d2e---20506598193.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/584d7fb8219da7eb87d288c755b1d815/febaxi.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/tiripetonexajifinoxutuk.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/24183801973.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4034026c11---88083798737.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/67448493128.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f086ece43a---wepevozafebipat.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af22622fac---nonevegajurivesavupu.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/wurolabilabi.pdfIn PDF document text
    • http://elitvorota.ru/f/file/26919677269.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/68pdlmgtvlkmhibivvajajm34h/zojojemalerojisi.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/vesubemiviteridezuwi.pdfIn PDF document text
    • https://fallsplat.se/file/lirodobonenukelip.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eced3de9e2---segazi.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ac551a5018e---73579502731.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/75000796020.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba45d87c211---tovopum.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5da505fe0f---tapipokepila.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a568e121b57---46696303887.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b7cf262d9---gizugisabutiriregum.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/885c9e7e2f7c9d8e69d9725d99bae194/roviwumilukumaj.pdfIn PDF document text
    • 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_off00012419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12419 10748 bytes
SHA-256: 7e585754cfebeeb959a5c6877be3837d45eb704ce8f511d91e7857ac51f45fad
font_01_sfnt_off00013c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9A 17740 bytes
SHA-256: e4697e94e726df352a0816c7221babe1efb5928a8a6f9b2ca69ab5fe386aa591
font_02_sfnt_off00016a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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