Malicious PDF — malware analysis report

Static analysis result for SHA-256 8870aaeb39d03d28…

MALICIOUS

PDF

86.0 KB Created: 2021-07-23 23:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 499ac223ff6a026d3eb0b6c837cefefd SHA-1: 2069de8bafb2576a97d40507c4e407c279977f44 SHA-256: 8870aaeb39d03d28cf9d29db8f5d39f27a0c184717908ca8f622b12a0b07ca07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is structured to manipulate search engine results or distribute links across various disposable hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160817ac13982b---28141989468.pdf In PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/vebubofigowedorage.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afc34710b5a---nitexifivagidugutugab.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085edc58e1ae---62336896499.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/regufijasezirulade.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/nurolemanuvefopewalowot.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/vonigik.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210611_B499B56A59909A34.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/34624392370.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/wuvukilaforepegemiwaj.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/sewiku.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/50ce65631fe3d49d37d1219af00b06b5/8100618956.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/46228668259.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/52367220481.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/4219449475.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ocn79fs7lk8salctjfv4qcc051/mugazu.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/8fc9e1fcfa621ac6401736a660712232/79996716277.pdfIn PDF document text
    • https://cristalensi.com/public/File/1888981676.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/6a45bb2292b01a13949ad58c5c056b1a/dabotagetowapusu.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/32faf3850ba27f210cbb1170635213de/xigekusiwefe.pdfIn PDF document text
    • http://innotack.com/userfiles/files/96894490725.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c279640a42f---97034798188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=can+you+really+solve+a+rubix+cube+in+2+movesPDF 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_off0000eefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 10964 bytes
SHA-256: 173e61a8dda7ccb85c2396b0826bd6599582214355842177b8a5f519462abc1b
font_02_sfnt_off000120a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A1 16004 bytes
SHA-256: dd1f4297a3205e4a9153cb70e32965d8a28637dd60d6f071bd3a2f44ddc3b284

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