Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c49c9a44a8db8a2…

MALICIOUS

PDF

94.3 KB Created: 2021-06-30 19:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 70d567858eb2db6730d697ad5d54d15a SHA-1: c2f5ee262dd38cd808cce6eb344b4660a78e2400 SHA-256: 0c49c9a44a8db8a266b88178e31916e4d8c6e4d118ba55eb42f2dfe31075eae3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing attempt or a download redirector, likely leveraging a PDF exploit or social engineering to trick the user into clicking a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db78901968---70672157784.pdf In PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/7vjrgm540visfbm6ab4r08j6mu/97536522410.pdfIn PDF document text
    • http://siembra.me/uploads/files/65669519793.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/39724384366.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/puvoxiwi.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf175c0026---debirikimukusa.pdfIn PDF document text
    • https://abeess.com/userfiles/file/jewumorakozexan.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/lutawure.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/28c14160763f2c57fdb9bf8dcc59a57b/mukokirujoguma.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/47431708664.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d8b2ae46711e88b16f0866ac61a984f4/88278921988.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/f9ca5ff49d24e2ba79651089a82480ea/papawobemol.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061722184195.pdfIn PDF document text
    • https://tipresentoio.it/images/file/66386367776.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/34620165363.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/28f768612fc50be48d76b60381d05fe7/61242012807.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a777d7e709d---fosimuxok.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160c11bb10b6e6---26738700143.pdfIn PDF document text
    • https://actorconseil.com/files/file/mitulaxavodogogokejip.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/65956439345.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/q8d9j0tr4qmsv1t57h8i5gk1g1/rekazux.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5a5cb7ae9---vejimanejerowutuxil.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/aqj76vgsihrhsdcnhr838seg3p/48068194171.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/df3cc8a0b8ce8372313c2457f7c6aaaa/84270527447.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/79eb0a522055a3dd097ab8a99555a130/mesurugedeserunu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607875532529f---gebet.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072901140c29---dunarew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=payday+game+instructionsPDF 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_off00010c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12492 17520 bytes
SHA-256: 5b6d53a93b39c3325d568eb78c347d87a87bc6df49fd95750bbb02ba7b4662ac
font_02_sfnt_off000152c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C2 10880 bytes
SHA-256: 0e6359da82e327905ac28dda3e7e6a998b505b0389e88fdbe14a97d81c7228eb

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