Malicious PDF — malware analysis report

Static analysis result for SHA-256 8185819465a2cd4c…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 12:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 460b6b46b7c6f409b16efb6e982c1f81 SHA-1: 0183b8b1358682dd9271df137b62f921d48a983f SHA-256: 8185819465a2cd4c69f087d1c61c91fe828f317999b2c27bf5d2558abf74bb85
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is unreadable, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://blnk.eu/userfiles/files/negalaxatezajef.pdf In PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1610675448aafc---15318918880.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/tonobamad.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/19107434005.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/26965316179.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/87566032010.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/e46bf5bb85e16f0c968f6ad5879afca3/kisuriwaxunu.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/54393518600.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/durifu.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/79034035556.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab75cd1e83b---79573117750.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/bihn7no2ek6ajfhqrvlqatb42a/32200077203.pdfIn PDF document text
    • https://le-luc-braslou.fr/images/file/47188211751.pdfIn PDF document text
    • http://ore-processing.ru/d/files/sivumugafup.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/suxapopugesireniranagi.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/21080614074784333549f8b.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/83690419127.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ad9d68ced359aa180b1abc88d403d9fe/88373193385.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/87096867825.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/72705611490.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/86595895271.pdfIn PDF document text
    • http://strandedtattoo.net/file/24608483341.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/51037911681.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a0ff2c414---39248100531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=timex+ironman+triathlon+watch+owner%27s+manualPDF 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_off0000da44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA44 10780 bytes
SHA-256: 2ffed317ae64da2365c244e52319402013fda7f4f9bdfff6ce86517d4f52c4bc
font_01_sfnt_off0000f306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B18 19284 bytes
SHA-256: e3ecb899e18b46eead07b3c81fc327cb827a7c2ab0b095ebb4a3ccae78394c1e

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