Malicious PDF — malware analysis report

Static analysis result for SHA-256 b946c421820cea53…

MALICIOUS

PDF

83.6 KB Created: 2021-09-15 00:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31843f55273020156c07710b1b55a09d SHA-1: cc3ea77d1684a28017a21eb4cad8611b09a3e1c2 SHA-256: b946c421820cea536d8a53fa7619c7d718fd1763f597288e97e23ae7b94316d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users to external, potentially malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://drafthe.ru/uplcv?utm_term=how+to+stop+autocorrect+in+android PDF link annotation
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/91395094664.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/g630q11ocr17kgcfpq4gaqc657/nakejekasurufubupowuvor.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/zivojafufixuzisijipero.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/lipazemofemujesudop.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/nifidizewo.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/fiburutejin.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/76694959003.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb344df133---13250913311.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/rakaboxewazafaredunav.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f08dde2d82---pinekitoku.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090503450876.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/99553707464.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/pabipal.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/83805212983.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/391332397.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210913124342983.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/zorezifazogowusowaja.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ca7c31cd6440216c3f00d44b4d70320f/mefew.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109040256371809.pdfIn PDF document text
    • https://mackbeks.com/files/file/pifurowufijokizufexexux.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/zidono.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f34a0a4799---62200943541.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/43d885f15ca98a093629aa96890d1eb0/bowujasijenupomulafenaso.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_off0000ddc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 19316 bytes
SHA-256: 22acefe2fc6dd8f9f898e76ab06e067bb9ac5863dfc50cdf0b1ff90f5e5f2790
font_01_sfnt_off00010fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEF 10640 bytes
SHA-256: 831bd174e354bac4bb3108d613f1578d9c53a1946702a11e3a8fb29a71fe5ed1
font_02_sfnt_off00012877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.