Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e19f6e55a7de36…

MALICIOUS

PDF

85.8 KB Created: 2021-09-10 14:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d6041e4c2a4c09028972e124425b86f2 SHA-1: aebca37937c3392c9e83a063d88380386f221bec SHA-256: c7e19f6e55a7de36b3241701b7c021cabed5fe8b0bc56939609b66fec33c5134
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to potentially compromised websites or are part of a link farm strategy. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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 http://paroissedementon.fr/upload/files/luroladawijasirewafaf.pdf In PDF document text
    • https://inmaabiladi.com/userfiles/files/sokim.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/19947166609.pdfIn PDF document text
    • https://razredna-nastava.net/files/81314998689.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/ramavisotafimuwaj.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/juxakokoguwidonutoniti.pdfIn PDF document text
    • http://strandedtattoo.info/file/fetotubibagidit.pdfIn PDF document text
    • https://rais.bg/uploads/file/96455985917.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ace07df2e---pudefewamajiloduwan.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/48675659180.pdfIn PDF document text
    • http://1careglobal.com/upload/files/35574796063.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/777379891.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/49183705778.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/68363911406.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/rivovitaredebix.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161311de0068b1---51181577066.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/pepunebovosobimawunevuzex.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161327eb4342d2---13052888816.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/59164146264.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/48797547880.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/pazapaxexofadad.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/lowusemug.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/vujakomokuw.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/e90te5ksmq2t8sjfnl5c2bfft3/larorizaf.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109040728016798.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/fuvixe.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/56920214807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=papel+de+parede+para+celular+android+hdPDF link annotation
    • 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_off0000df21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF21 10444 bytes
SHA-256: 8c8469e9414a95513420042e7a25b6f6143c85b4a0da87e0ee0025b31d424378
font_01_sfnt_off0000f69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69F 22452 bytes
SHA-256: aa26786bd035ea320413b2a406f72e3f9a1caacfd5177100c560f47656372c60
font_02_sfnt_off00012f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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