PDF malware analysis — malicious · 15c01a04fb06894c

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 15:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 677402c29482169ff12490288248513b SHA-1: 4ce0e7846536f9a2b4d1436b8829e2187256567a SHA-256: 15c01a04fb06894c2d3e0337c78af1f3054dcadb7bf124d9d1be97db0f195804

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites or disposable domains. This pattern suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

Nyx PDF Classifier malicious score 0.9485

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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFNoValidXRef. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0db9b813d1f115b863b1991b6271e763/bunujiz.pdf In PDF document text
- http://surausa.com/uploads/files/vowinonudigubag.pdfIn PDF document text
- http://gzperson.com/uploadfile/files/97902639952.pdfIn PDF document text
- http://megaprestige.ru/uploads/files/42760167792.pdfIn PDF document text
- http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161393d53a392d---lanawe.pdfIn PDF document text
- https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/78518903014.pdfIn PDF document text
- http://teledirk.com/d/files/dikekulavimoruvenirejop.pdfIn PDF document text
- http://zamgph.com/uploads/file/041045064615.pdfIn PDF document text
- https://softwebstar.com/shop/userfiles/file/91736903470.pdfIn PDF document text
- https://wonwon.taipei/photo/file/xigogerijadive.pdfIn PDF document text
- https://xn--z4qq44i.tw/upload/actfiles/6344219010.pdfIn PDF document text
- http://spbmedax.ru/sites/default/files/uploads/84403115636.pdfIn PDF document text
- https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9bf4ba8de5f6248f2388a75d14453934/sewadin.pdfIn PDF document text
- http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613726314a7bf---90050039307.pdfIn PDF document text
- http://vaynhe.com/upload/files/sukil.pdfIn PDF document text
- https://steammining.com/userfiles/file/20574004046.pdfIn PDF document text
- https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ao4v2u8psaroot6jb0li50kr8l/pazakanogonefukikotu.pdfIn PDF document text
- https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/31bc2b8e156033c79aa7faaed1cdf1d0/69083256871.pdfIn PDF document text
- https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/e746bf924a0a20b2e846d3087dd1afc4/zajopekivomo.pdfIn PDF document text
- https://xn--z4qq44i.xn--kpry57d/upload/actfiles/37057449274.pdfIn PDF document text
- https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/3gumk5qrkrrbv8ad0meh42p6d0/vegunejizoruni.pdfIn PDF document text
- http://gaytonfa.com/upload/files/35323690058.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=deadly+pickup+movie+onlinePDF link annotation
- 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_off0000e82d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE82D	18304 bytes
SHA-256: `36e2e06b30b6e2332e53f836632e1a03901f69273f4d922c2076e26fe3cdbd04`
`font_01_sfnt_off00011806.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11806	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001301d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1301D	10680 bytes
SHA-256: `48f85eb867cc7f515e8a69d6c2553f6e4bf911d7e0f9278c6bd970b32ac50f77`

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