Malicious PDF — malware analysis report

Static analysis result for SHA-256 829f9f703105d940…

MALICIOUS

PDF

98.2 KB Created: 2021-09-08 04:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f5fcc0dd329f483233633670d732e7e8 SHA-1: 3cfd10da749fe03167fb881d3c33f959ceed119a SHA-256: 829f9f703105d940a09419b6e54b7a2eb5ec54206a2bd1edae012de0c92c0406
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://sharjahcements.com/images/bulk_images/files/kewofir.pdf In PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/132395f5c86a3eedbf1e55a5c3995fdf/savuzo.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/voxonetekafirutoviveto.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e62cab15dcd53c5094cc7fdef9a4333f/11800239854.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/23706424071.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f86044b139a---68600279244.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ugusegefo.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797bae4107d---85720772112.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/a294e0121e3579a6dd1ae39d4a032bbd/raxipu.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/64178216689.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/kagisuvulajobusi.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/zoletilozevakuzajex.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9a2c29730---33136125724.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/jexebe.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/29766471493.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f84f5155d9e---konoga.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/0eb2f7ea484dc220c5b867b60ae78149/39915543576.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/wopelelememur.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/70880393100.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e456bbd1fcc---82404292831.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/fanawimekatixamo.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/8b9053f0b797aa10bb2b138010e9ecfb/31211282720.pdfIn PDF document text
    • http://cy2hand.com/userfiles/61417768118.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/sepodakunave.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/lonalemiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=derivatives+problems+and+solutions+pdfPDF 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_off00011b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13342 17784 bytes
SHA-256: 864a76e98acc2175610a6c59576c187c3ab3b88604624be040b8f27df673b06c
font_02_sfnt_off000161bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161BC 10964 bytes
SHA-256: 02f03cde77d17f53c8316d7021ae9845392e92d3a3a005f8d39aee0321cf353d