Malicious PDF — malware analysis report

Static analysis result for SHA-256 af98999d263fbbd0…

MALICIOUS

PDF

75.3 KB Created: 2021-09-20 00:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5049f3c676232276f6330ef8328ec131 SHA-1: 555fdf6e3d2587a4ec435fdbe99b9e03995107fc SHA-256: af98999d263fbbd06cad04c3629990558df372be0a0fd37fef5003b4a1a94bcc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lead users to potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://tese.in/ckfinder/userfiles/files/17305441179.pdf In PDF document text
    • http://amindoost.ir/images/upload/files/34419650519.pdfIn PDF document text
    • https://angkagenap.com/contents/files/29235760544.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/16241668106.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161330ba7bcb67---xinowi.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/89856284220.pdfPDF link annotation
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aea3abb28f---foxisejidifa.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/81143867671.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/xiwoditomeliwezezajabetu.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/doxiko.pdfIn PDF document text
    • https://rm-parketi.si/uploads/73707638263.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/nisujanogaja.pdfIn PDF document text
    • http://wawa757.com/uploads/files/vozitugupajemepekunuz.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/biwizorixezuxidode.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/97850350345.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/dusejinewimireniwotijo.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/13005207741.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/88189458801.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/gerobidukixepixaxu.pdfIn PDF document text
    • https://kapefashion.com/files/files/38542549160.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f327b5bfc---48808526143.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/tojikeguxiwixirixiz.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/14546333159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=can+you+run+an+android+app+on+windows+10PDF 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_off0000c325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC325 10616 bytes
SHA-256: 6c10763e15714b74a331afde01f5cd58995e3a994c1b10404bd26a85ed3712c8
font_01_sfnt_off0000db94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 16932 bytes
SHA-256: dad276dad0613040bdeafbad957b11943b7ff79ba32d144d956ef1076dd4e1fb
font_02_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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