Malicious PDF — malware analysis report

Static analysis result for SHA-256 23273cb1ca6a6d16…

MALICIOUS

PDF

92.6 KB Created: 2021-08-21 14:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6f973c19ea6a61968497036f3bb9b6e0 SHA-1: 6d024224fb623b5aa39040c8586277937ecf2ef4 SHA-256: 23273cb1ca6a6d16ec0dfd34e188575047d9cbc9e8f7c0cffbc1b80398c37deb
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 or are structured as link farms. Heuristics indicate these are likely used to redirect users to malicious content. ClamAV detection and ML classification confirm the malicious nature of the PDF, suggesting it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://studiotecniconuti.it/userfiles/files/gapopum.pdf In PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092699b7e61d---94648772619.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828287c60a8---kisejiwajawexajigolagu.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608eac9e0476c---dexinunowajuvolamoxume.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1f4ab8df8---zejujizipejoliken.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/8d37f1bd9e687bd09b60a5beff76f5e3/7509857069.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e153d7889---lasovusefel.pdfIn PDF document text
    • https://cristalensi.com/public/File/14923144517.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/28807980904.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/39845379722.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1185e9fff---81411470884.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021061412575687.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161140f02ec268---65830462801.pdfIn PDF document text
    • https://ladangmimpi2.com/contents//files/sevonewugiso.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f45b504f59---52885100314.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/t8f7bfife7cl60rp5bejhrdvou/ludetojulafutisu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/2f4e154460183161705c27216add176b/pozegosisarowus.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/nenapulanu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56e5cd95f9---39555792634.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/85805348290.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/lifawogivi.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/aa57c20f2eff799db1c19897e2de29cb/1323397330.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160725f607fb98---48314814338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+haunt+pdf+trovePDF 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_off0001051a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2C 17740 bytes
SHA-256: 455f9ba052cfdbc136d034506bc9513e1d0cb78c8d1942ddc043d977940b8974
font_02_sfnt_off00014bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BBD 10416 bytes
SHA-256: 29b7617043ec24ab609b8324eb548d6f1c365d8aeabf9b53b3e3d436ef9d013f

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