Malicious PDF — malware analysis report

Static analysis result for SHA-256 6107327863d0d2b6…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 14:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c6ab353d282570d5bb042b813d8ded82 SHA-1: 0416b360d61e234c42f9dff4b9cff38a8e960028 SHA-256: 6107327863d0d2b686fb4d9978b9125941d4e0e1082031cf4d4016e8587571be
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839ceacdfc4---zunofolanezepave.pdf In PDF document text
    • https://lmbri.com/WYSIWYGImage/file/34489631588.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161247cc4f0942---10042388191.pdfIn PDF document text
    • http://ruihuitax.com/files/file/93892873184.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fed8c2250---boferul.pdfIn PDF document text
    • http://jiab.net/userData/board/file/nafutesedivugepamazata.pdfIn PDF document text
    • http://abroadster.com/files/xamuwip.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/99439091c72582a6941d44cc64a4f601/jalemizagamojasopul.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/14030081391.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/98809696100.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cad51c2f017---15180050739.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/posivivumomope.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/dowotepalefosofolapibefof.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/rasomovuwepakogena.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/28c8b445e20cd539843f312ce1009905/24363865290.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/jurunuvigitos.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160aa16ca7397a---wekabizuze.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcf0299227---renopew.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/mamubejobudedosoduni.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d84db9412fc943a3cc8987132660ca9d/50857452957.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/57182786502.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee478761308---dufudevijenef.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/19623062634.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611adf549bf98---82890768233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=raindrops+keep+fallin+on+my+head+piano+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_off0000da68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 18688 bytes
SHA-256: 43a0af964e9f69939e605b77ce2fce2f05aaa12ecc2d1931c365c62e73c77bd4
font_02_sfnt_off00012441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12441 10916 bytes
SHA-256: c39bb0b04d2e335c75f25cd229daac1b565fdb4573a0ddd49a3c75e8a5d3a49c

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