Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bbffe7a735cf9e6…

MALICIOUS

PDF

74.9 KB Created: 2021-09-06 07:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89b3dba385d6282522ee7bb33c90139b SHA-1: 6691ab5df546de5b7e0a114eb4f55edd26ea8644 SHA-256: 9bbffe7a735cf9e654a789413d765ca9ba77020d8dc6fd7d5bbe477bf3aaf0e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate it functions as a link farm, likely intended to redirect users to malicious sites for phishing or malware delivery. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://drafthe.ru/uplcv?utm_term=holes+worksheets+answers PDF link annotation
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mufoxipusozetige.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/44050211991.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/zifelifize.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/gapumoxom.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/wudivojovaj.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/37209279632.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/83038309732.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160729bfea055c---mubakuga.pdfIn PDF document text
    • http://wardwrightself.com/clients/863644/File/gunugalapeterakopebavil.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/0snl9v10kbs3tn74vo7n15cb5n/vagew.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/roziketaxoxajexede.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210809_5CC6DD49568F1B4F.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fd1de926d74---80028023381.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/c220e758137a737af2a224b59e67eadf/98094443584.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607733852e5d3---pololomepizegukamebupuvuj.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612de7454e89e---44585199708.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/tatidubigirafivotu.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/44433946252.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/29221622765.pdfIn PDF document text
    • http://allier-genealogie.org/File:/53594263298.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/41262485067.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b114cb88af---5063852842.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/85578272702.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/83633053759.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/68375220687.pdfIn PDF document text
    • http://brukbet.com/user_images/file/zibudizuduzose.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_off0000c139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC139 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94B 18416 bytes
SHA-256: 115c44228184654100f0076b87706003c11691c822dcdb7b01d80c3be326be0d
font_02_sfnt_off00010731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 10284 bytes
SHA-256: ab2ab9f1928c4e753236760cc86ae419a5bb7adab72917d05810412532889b29

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