PDF malware analysis — malicious · c620d98c3568f431

MALICIOUS

PDF

78.0 KB Created: 2021-09-15 23:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 699459f75f8613860f6b7bb817b40283 SHA-1: e58e5c9b8f3ffb2b6ef4a745d2abf00546f60b22 SHA-256: c620d98c3568f431513a19aa61d22b93c6c09bb5d5c289f66c758925705294ce

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a link farm designed to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=benefits+of+technology+integration PDF link annotation
- http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdc57a6c82---33432545534.pdfIn PDF document text
- http://rzn-house.ru/upload/file/vimezugofi.pdfIn PDF document text
- http://oikoscoccatoarchitettura.com/userfiles/files/zagabadep.pdfIn PDF document text
- http://turchifiltri.com/userfiles/files/tirozikusepen.pdfIn PDF document text
- http://nppgursaraijhansi.in/ckfinder/userfiles/files/83804285592.pdfIn PDF document text
- http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16216064226.pdfIn PDF document text
- http://thegioidahoacuong.com/uploads/image/files/27151622219.pdfIn PDF document text
- http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132620de6b8d---sajon.pdfIn PDF document text
- https://eternalbliss.net/file/notevosomatosizilizodu.pdfIn PDF document text
- http://www.s4b.nl/upload/files/78692039308.pdfIn PDF document text
- https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142411a62300---11301110352.pdfIn PDF document text
- https://kamhosting.nl/ckfinder/userfiles/files/kexat.pdfIn PDF document text
- http://uptownherndon.com/uploads/files/zixixuposobomokejakor.pdfIn PDF document text
- http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161340ed52c676---13111093029.pdfIn PDF document text
- https://www.jaegeraviation.com/ckfinder/userfiles/files/7522998273.pdfIn PDF document text
- http://kancelaria-perfect.pl/app/webroot/media/files/puwemefifanenizuwifejof.pdfIn PDF document text
- https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a123019b7b5302030350c3ad91c78a80/57824149351.pdfIn PDF document text
- https://kuepancong.com/contents/files/69057264523.pdfIn PDF document text
- http://gloria-eurex.com/images/blog/file/74101272559.pdfIn PDF document text
- http://goldway.jp/upload/board/file/lamukepumo.pdfIn PDF document text
- https://organicearthfiji.com/documents/file/89276388525.pdfIn PDF document text
- https://nepalmicrofinancesummit.org/userfiles/files/nidemoxagejebokororeni.pdfIn PDF document text
- http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27599111573.pdfIn PDF document text
- http://vncdata.net/app/webroot/uploads/files/42583603175.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000cd19.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD19	10780 bytes
SHA-256: `fb36483653846a47e56b5c00a2afc2c47837ff854dfc4344c6317b66f8a4447e`
`font_01_sfnt_off0000e5f2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5F2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fe04.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE04	17060 bytes
SHA-256: `e772d1d4915610de2f056ef4904a0e7e32934cff651e6ec3186e1a8546bba928`

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