Malicious PDF — malware analysis report

Static analysis result for SHA-256 e210caccc42aefec…

MALICIOUS

PDF

85.4 KB Created: 2021-09-06 15:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cc98c98663a0edb966b56a1743ab925c SHA-1: 19813fdf0dd91b9755e0dee252cf7b6554ae6fe3 SHA-256: e210caccc42aefec340a69f648cd6dcd96b82bed064edcb2a49f99ad18e1b36e
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The PDF itself is heavily obfuscated and contains no readable document body, but the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://evevoyance.fr/adh/.-/file/1124208247.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4962b1dee0---94510408821.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d45730cd5---81600478288.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607797102e87b---nubumogawidekuvu.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/24136111902.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/kobarebumatenusaribod.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a32b351c4be---diporujarupugoxufekutuf.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/20311814556.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/35914966073.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/036ce475b8790775efac133c7687d9d8/31199850785.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a573c3de9---piwipebevesox.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/pazakadazutemagozukisax.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/93982875558.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210730020202.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/51236431570.pdfIn PDF document text
    • http://huiking.cn/uploads/file/032050099197.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/vetowonakegovoreruzi.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/40254653468.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/towefe.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210828_00FD42BBD41B5E8E.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/38580532161.pdfIn PDF document text
    • https://ms01bet.net/contents//files/93534418680.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1f881c15d---kupaxuxobusumigo.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/xepup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=manual+of+nearctic+diptera+vol.+1PDF 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_off0000e640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE640 10720 bytes
SHA-256: 1e971679fd6b187995f4dd1627786763b7d968854daf943367389a5a610ce342
font_01_sfnt_off0000ff08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF08 19008 bytes
SHA-256: 1793478c51ebf6644569e5f5a4b642a1d6b9ae72f6cf597a4e7e5ba6ea76c60a
font_02_sfnt_off00013001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1