Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca41317f913d7ce…

MALICIOUS

PDF

94.6 KB Created: 2021-09-05 20:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb2c4bc78facf8e00a30452c06cd5bb3 SHA-1: cd61da16af389be2ec950736de117c5a4b7e1f5f SHA-256: cca41317f913d7ce27c38c873e962b2629950f273e1fa4718fe545c02ad335cf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm is designed to lure users into clicking potentially harmful links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://dursunguney.com/userfiles/files/tixogegoroxarexigivukotol.pdf In PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f364f186d0---muxuvidavukesuposog.pdfIn PDF document text
    • http://scan3dsaigon.com/upload/files/35059760432.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b894665950d---jafasulapekuj.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/6474108390.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/teboxurozi.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://emirates-offshore.com/uploads/image/file/89274568333.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b68088013cc---vabovavaxetukalopoxebij.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/edf31e7f90f751b3dc463137edd29cb1/roxusitopilajomibe.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/84748dfb3bd61be8e706238bd9b1b049/winuwebe.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/16600347564.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/tafusufasatafenun.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/bajilidevofobosib.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/37414334883.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/wazizaladipinikiganeg.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/14713416571.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de314a0f849---negapoziwegu.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/75779195619.pdfIn PDF document text
    • https://landbar.com/upload/files/60989702426.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/baduvurerurokeromad.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080e6c9c2c42---desuwumamudo.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/783c5786453b645ec2c4c3dba36424af/boposejapewaximasoxut.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d96bc88a3---gikobowofepixadas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=seekers+book+3+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_off00010dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFB 10468 bytes
SHA-256: d4ee0a33d9a20c05dbe3dfcc9f962c0007f23227741261cd992500cd21d670b3
font_01_sfnt_off000125ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBE 18196 bytes
SHA-256: b466c7f3263f4690228801a9cd1e1116947f3419a07cca5b9effa9d9e8f41e04

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