Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ef9a159e56abe9…

MALICIOUS

PDF

94.7 KB Created: 2021-09-01 06:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 68698fcbbfbc8b44d91df48888c6ddf0 SHA-1: 8538161d70d1fe1920cd31da81835383548c1ddd SHA-256: 42ef9a159e56abe9ddb683b3f661cf34cb90871bc018b5b953583ca335cbbfd6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64fe83ee77---popeninadegi.pdf In PDF document text
    • http://modnyi-buket.ru/uploads/files/18483963353.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/8f4ff7ffe22cbfcdb842230129dd9453/dozizomaja.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/78140981459.pdfIn PDF document text
    • https://alutat.com/data/file/sobotufagetepiroj.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608952b793159---92335969957.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b885481ead9---15135422806.pdfIn PDF document text
    • https://inncredel.com/uploads/xumumuk.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/57673084819.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/pajepuruxabemufonetem.pdfIn PDF document text
    • http://chromavials.com/d/files/dunoje.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d39c7c889---bomenuvumibamamuze.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/cb14691b6185212bad8a97b5f0e5deff/60578051813.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/cqqp5i6c2fmdopp98e79jrim5q/36821444168.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071816339949---torodafugekunitebitab.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/pasasojesegiv.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/nonepidowolimisugefe.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/75159656719.pdfIn PDF document text
    • http://elm3rad.com/file/faridobib.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/79063946984.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/80189019132.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/kitubatori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=redhat+linux+interview+questions+and+answers+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_off00010a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A90 18220 bytes
SHA-256: 5c0bcd92da4ae44f3962b695c2d19224a3c920d4abcf955f7441d0a53231521c
font_01_sfnt_off000139ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D1 11140 bytes
SHA-256: effa531a412b7a76f7d94b661932fcb248c04c4fcb594553a2f1b1dd76902cd5

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