Malicious PDF — malware analysis report

Static analysis result for SHA-256 f906117927ac3b45…

MALICIOUS

PDF

88.6 KB Created: 2021-08-03 10:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 93b44ed6884e4c4b1ca6ab4b280c9539 SHA-1: 9ea8478a794082e2e3e8d0121bdd761dcef932c1 SHA-256: f906117927ac3b45d07fe82cbcf248d2abe348ed0d106d8c926ee1aea8114022
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://sghscsjamarai.org/guruhargobind/userfiles/file/47016167850.pdf In PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/8ea3a8a95ae82b0c0f357446bca3a7f7/61628160326.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f528bcde3e---27833963337.pdfIn PDF document text
    • http://concept-art.nl/app/webroot/files/userfiles/files/11816485114.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082daae6a263---61304339684.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608506232bc08---40099890021.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb06be867c---tivusavonakajilefamobuwe.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/e478b6174322ae7a480450da4e5f0d41/lufunefepumijex.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/98647049277.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210627114731_654329937.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/93638063312.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c091008bc29---16307315122.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/mogipepulubepi.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/xemazorewutiruvitipo.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f9c09f6cb9f---karam.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/mimilikigelisom.pdfIn PDF document text
    • https://kar360.com/resimler/files/69773330038.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/gke9q2m85h21t61o9hk6poj016/61663206481.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/59582476216.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/7113953312.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/57eb2ba323f5a485f5ee52e9be1ecfff/75056489826.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///vejigubuzuka.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c8f1d0f42---xuxoteporifibupavudagum.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/56878196690.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/708gekuteqdrd2qn845s8krsg7/48209910212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+prepare+appleton+farms+hamPDF 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_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 10608 bytes
SHA-256: bf2914883e658c878095433961e6a7ea079bb738b953ac7d79b8b7e013a8488f
font_01_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 19056 bytes
SHA-256: 6694395f6cfa5abc0dbf4d4ba34127e3c7291c78623c982f76888576bae52b10
font_02_sfnt_off00013d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1