Malicious PDF — malware analysis report

Static analysis result for SHA-256 8307fb9a15945aaf…

MALICIOUS

PDF

75.1 KB Created: 2021-09-01 08:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e51597088229b02ae121ef1b48e90ab5 SHA-1: 5ae354c5a2f1c1a33138d4cd741908a38750973c SHA-256: 8307fb9a15945aaf6747743c50e04f43c742fe9b6435463e610df00a363b870d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. These links are likely intended to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://scpt.it/userfiles/files/13595357672.pdf In PDF document text
    • http://carszana.com/image/upload/File/miliwedutezewivawerojom.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/38855749358.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4336c1379---88216184558.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/49394373868.pdfIn PDF document text
    • http://hexindechem.com/upload/files/pupuzoxipogefemepijonofax.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/dc4587410e3737e3c1defe82b6a67cdf/rolemosetaz.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/74637653512.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/39441298256.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/zekirifolov.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/zitemip.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161134e7341995---60718369593.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827da4121a0---pinewuti.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/lilebetijazibaz.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/bosawurutafesip.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087364754b1d---xizetajozopaxide.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/vdsh4qt9mbld3l1o6j8bmtcf4v/23777868264.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/a34806fd6bdb5774a13f97561b5cdcb6/64213132201.pdfIn PDF document text
    • https://ms01bet.com/contents//files/tisexusepogijir.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210724185732.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4b87c279d---sojunuzutivezot.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/fibolemomoleronafusaxip.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/fc9fa2303833d795e1ff7a714645820e/zixarez.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161267c2127db0---midoten.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/qod1h966495terei0jf5dh4tme/72538825874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=puzzles+and+conquest+gift+codes+2020PDF 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_off0000c1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FC 11100 bytes
SHA-256: c5612fb5c4edb1ed9b07a17d90310616a9aacc8848c7d63c6d886c15edfbadb1
font_01_sfnt_off0000db97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A9 16552 bytes
SHA-256: fa3074b67566aecce7567d8c61174f7bb498b8859dc5879ad8e81b73a188e53b