Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb7f7be23fdc6c3…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 09:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed429c402a88b0b5fd8ffb63c5e40df3 SHA-1: a70109ed664cb7e6236d2c43380252f0926e2b20 SHA-256: dbb7f7be23fdc6c3883826bf5d2fc3d526423f22c2d4465eb36c42504182bf5f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614615790c3b7---gasuwitopiroxata.pdf
    • http://weifong.tw/fckimages/file/96714040802.pdf
    • http://infas.cz/images/wiswig/file/63152252924.pdf
    • http://miyagi.chi-kara.net/Upload/files/32216866334.pdf
    • http://martonaroniskola.net/userfiles/file/mokemasokote.pdf
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/mulinusepegeluk.pdf
    • https://adverto.ee/userfiles/file/77546352968.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/7dumbrgk7ivf8thf9bjo2in23j/53337956506.pdf
    • http://vzwsportenmuziek.com/content_docs/72610960130.pdf
    • http://highdesertrent.com/newsite/images/uploads/file/66277031432.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/6bce63f411be01a8a5743603b46918c3/favuva.pdf
    • https://icoachyou.biz/images/ckeditor/files/xewabufunefe.pdf
    • http://gandolfiarchitetti.com/userfiles/files/xuwogerawiresegisad.pdf
    • http://wuchem.com/upload/files/69244808471.pdf
    • https://bitree.com/ckfinder/userfiles/files/gikifudanawunutusadakena.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a20ce3051---62544338778.pdf
    • https://www.aspart.ro/ckfinder/userfiles/files/64509220935.pdf
    • http://jamesandsons.ca/userfiles/file/gulaborerebodopofijape.pdf
    • https://mihalex.by/files/files/rutalopogi.pdf
    • http://formel1vermietung.de/userfiles/file/tuxisisevovixuvuwub.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379cc367ba3---98964440828.pdf
    • http://ave-france.com/pics/files/32025658204.pdf
    • http://turnyras.lt/Files/file/54745524651.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=shader+for+minecraft+apk
    • 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_off0000b213.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB213 16792 bytes
font_01_sfnt_off0000ca25.bin
bafe588b44fcab72651dda4d6bd41690f22e8a309a234327462eb2dc80015ebb
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA25 15228 bytes
font_02_sfnt_off0000f0b2.bin
ebb80c3d900d8ca27fa6ed986c02b500f201c9d3a655f1ab82d078c45a2e0154
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B2 10836 bytes