Malicious PDF — malware analysis report

Static analysis result for SHA-256 603cdcea7a49358c…

MALICIOUS

PDF

77.0 KB Created: 2021-08-12 10:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 59cdb243e6af127f179f675ffa59d582 SHA-1: 182973221a4b66353d49781a2f2a09f15805d36d SHA-256: 603cdcea7a49358c2833010a02fa80d16ab2bc5cd93abd95d3f886ed548c76b3
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to redirect users to potentially malicious content. ClamAV detection and ML classification confirm the malicious nature of the file, likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4117266ee---wisigiwebowonulimumugan.pdf In PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/d25c85ffb0f09c749297bda28a691939/rasumofumubexob.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/crji0dbpfklit90nnoa0ua0i0m/51235881722.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609404d0c6d9d---wavifapojasegamimarotozaz.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/9cb3086a1de43b526ea6dea60eb3fbbe/24250915424.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/g349nta5qn5955v3sijjr557fe/sidajuxi.pdfIn PDF document text
    • http://flavourit.com/uploads/userfiles/file/file/28072086165.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/979b5d4673cfbe637c71303f395cfb59/bubolawupa.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210527113326.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/43730116870.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862788d3b4c---74209827509.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/lafopu.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/topilevojuzamitabuzuz.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d618c5c31465a63ca9ff6b632e0878ed/jixokeropazurofis.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/777049901d0f10c8db80bda29fd37de6/43135641095.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/mubojixokerodid.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/95739884048.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/faruxuris.pdfIn PDF document text
    • http://abpaluso.com/upload/file/ridepar.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/rijumeretarigajasowizopo.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/79298433563.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/40450204229.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/pekifogemerateniwajugibam.pdfIn PDF document text
    • http://hyderabadibiryanicorner.com/admin/images/file/50570352797.pdfIn PDF document text
    • https://np21bellapalermoshopping.it/file/92309342648.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/22626763797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cambridge+objective+pet+student+book+pdfPDF 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_off0000c367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC367 11476 bytes
SHA-256: 0ec1339fe8a6168b96118e49d6b647bff026e671938ee44a92d56a9b786f4733
font_01_sfnt_off0000de26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 18492 bytes
SHA-256: 0541b3f73190d4f9348c5e53d94779ea6b7a43c4f7642a706a06b5436e145f99

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