Malicious PDF — malware analysis report

Static analysis result for SHA-256 370f43b5d8b30608…

MALICIOUS

PDF

70.2 KB Created: 2021-09-18 11:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f617eb44edaa8fdc446a0554409635a9 SHA-1: f98fed21ab76d4ccbdf26754e1a6cdf1090a72e4 SHA-256: 370f43b5d8b30608f0b4f534583a168a35c76431ede807d63af41d320b3d51d0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation or redirection to malicious sites.

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://dmkert.hu/files/file/mumotuxuvadinusofipen.pdf In PDF document text
    • http://kajo-frings.de/userfiles/file/31894155351.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/pilerikupuvofekajat.pdfIn PDF document text
    • https://promise-land.com/upload/file/fakujigibuben.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/93301539458.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/71673972809.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/58507948792.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d13bd37bdbde87e66c61ec6b024a41c7/bedijopufazarifirotela.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/kinalubibofowopagizi.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/3c6gsh3pcdfmaoi153jokcp7b3/jizaxix.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/95435525829.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/67283057265.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/nukesobake.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/52193223101.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/kikuvuzodiraluvigurokufo.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/gepadureteponibe.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/tobuzagafagefeju.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tamozubigidimararupuwaj.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/77468444264.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/1e7f428943464bf3520fdd085a576f02/fabejexazitipe.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/jomumirez.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/59362345376.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/dupobikumof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=talk+back+tutorialPDF 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_off0000b5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD5 10112 bytes
SHA-256: ceb3a51e37d47f3577ab94ee18362f9309ff6d391493a51cd869755decb2c620
font_02_sfnt_off0000e48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48A 15248 bytes
SHA-256: 31e717f86165ee1c810ec819177213dc0a29dd557b73a54f3f021dbe2bdc8701

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