Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df74fac905d9c07…

MALICIOUS

PDF

90.4 KB Created: 2021-06-26 18:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cf08656fe7c357859bf1a39236aeac67 SHA-1: 11cbf7f48e472a2cc6415e225051009c79a30411 SHA-256: 4df74fac905d9c079baa3cd0d06712dac5622d7bca0bd5716efec1b25df65473
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting. These links likely lead to further malicious content or phishing pages, suggesting a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/b4c1d9f02f49a934fe15b330b9c1ead3/89862085077.pdf In PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cf267fd39---95557791544.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/4d5bpp7ccs5gt8u3t510nkbl03/giweterozowu.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a310056231d---rifigigowo.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/bevukoretajamisewudun.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/o2fu9tkkc2f5p0vhitdaiisis4/rivewedunebo.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/50ae5bb7f9d9bdc364ce24e77499bd5d/15239875882.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06eef40f4a---vataduno.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608234dd2bab9---58962210442.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/chabji0bpq7q0mri1l2gr6kfm2/fawojamasezuzevogapux.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/76376188594.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/585d2a7ba6351d5c9b71fe547021a2a2/bikegesipexut.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8599e98539---37537467835.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee0f3ccb8a---peleluwolalor.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/6db6b81245896d92b78be7a057e244d0/17235552397.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b64084e089f---wotejurem.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/punenobenofewelaxeraw.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074422c7517f---35127490013.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/zizowiwiburuv.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/camei4blbs93fi631fpvi8o014/55120920477.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d6be8cad---fibomodew.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/7c1260f36265f7298406b6cbb800823c/31473686054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=iot+notes+for+cse+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_off0001020c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 16744 bytes
SHA-256: 5ea07cc44d78d3f2549e88c11c512840ca4ecf88fa2ddb9298aa90416ac1cdab
font_01_sfnt_off00012d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D87 10264 bytes
SHA-256: 76412fcd2d0454ae9fad90b4174944425b28a79d2b34f8e0391a1ee78855c9af
font_02_sfnt_off000144bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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