Malicious PDF — malware analysis report

Static analysis result for SHA-256 439221804dadab06…

MALICIOUS

PDF

84.6 KB Created: 2021-08-21 12:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02939238e73ccee478a7217ee9215d91 SHA-1: f1612eb12edf8dc6caf0aec7d37fe318e11ff660 SHA-256: 439221804dadab061e822bcf2f1984325c52aadbb5e5f0a8355e64dc8155dd57
156 Risk Score

Malware Insights

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

The PDF document contains a link farm directing users to multiple external URLs, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or deliver further malware. The document body is unreadable, but the heuristics and URLs point to a phishing or malware distribution scheme.

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://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/beb85c0b7f2b38ed34fdf86a1a8903d7/fitotenorapux.pdf
    • http://needychild.org/ckfinder/userfiles/files/36063365046.pdf
    • http://seattleteriyaki3.com/uploads/files/6483698754.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/hh4dcsd1o0bfq2a6lsbfg7j71a/62898865263.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b545dc641534134286294725a32d8846/guziwoxusipizekilutodi.pdf
    • http://elfuklid.cz/foto/Image/file/wixojunirezeritituxasibot.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfba4e26a57---15915700378.pdf
    • http://sattamatkapatti.com/userfiles/file/31362018365.pdf
    • https://kp-bs.ru/upload/files/liwibewevep.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ed687784a---mikumilatipi.pdf
    • http://koala-al.com/d/files/33057812839.pdf
    • https://blindnow.com/userfiles/file/pokawesuberup.pdf
    • http://studiofantino.it/userfiles/files/15829885425.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c994972ca4---33466182095.pdf
    • http://1night2daytour.com/ckupload/files/dironabinovimop.pdf
    • http://cityfate.com/files/files/83275337532.pdf
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/nusofene.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad63c0ad582---bopez.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90b8b3cb1---11550062273.pdf
    • https://feng-shuiworld.com/userfiles/file/89789164171.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e37f9407d---74304621719.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d44b0acff1---7133527837.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=algebra+word+problems+practice+workbook+with+full+solutions+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e439.bin
bf167c7a4d4f9f02bcff7d85dadf4a3fba1d76d3f53c41cc7cc87176988d9716
pdf-font-stream PDF embedded font (sfnt) at offset 0xE439 16784 bytes
font_01_sfnt_off00010fc1.bin
5e97a4bec3f31cd056a79744187f6e428198d27ef56219c4ba7dd7ad83ba7e88
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC1 11464 bytes
font_02_sfnt_off00012a57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A57 16792 bytes