Malicious PDF — malware analysis report

Static analysis result for SHA-256 2220bab54fe9c75a…

MALICIOUS

PDF

86.8 KB Created: 2021-09-01 19:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d5bfd6c541e64d1230bcb985895aa891 SHA-1: 9440b581c6718a45684f01537efede32f54c84ac SHA-256: 2220bab54fe9c75ae3d4f9da355437c05f3f416f9ac3bc48d8067fadab7aca0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://coretry.ru/uplcv?utm_term=first+american+horror+story PDF link annotation
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b9c1e435b---75854603725.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/wapefipovirepenofuvi.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/kogegigogozeje.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160947cdb2e271---konifitobefebu.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160900c736a205---12279747201.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc76e3d848a---59977390742.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/57860234612.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/87916962039.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160982fceef97a---sijojetogakoturidep.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16116154a475fc---78570932221.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d249de69f55---60463960038.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/rovurunas.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/13225394538.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161147e52caf9f---45947887322.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/40246002423.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/23705767184.pdfIn PDF document text
    • https://binhvi.com/upload/files/wenoregemujarukatogolun.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/15859032855.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6058ead75e---11574553693.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607662f00b95e---ruvaweli.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/48391679659.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/zuforiwafepavarubamib.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/4e8def7d6ce364d9801a88d1a33a8d75/97726849694.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d744db206931d060bb506a7355d2e26e/42412021916.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607283ea09ddc---xenojimuzelusoxe.pdfIn PDF document text
    • 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_off0000f2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 10540 bytes
SHA-256: cd85ba8742f0e3724ca09f74d2da699d0421ab1ee0f0531c6c09b74c6fc38b53
font_01_sfnt_off00010ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C6 16884 bytes
SHA-256: 9de06126452581c524fe5bd88a67ff5728996d3b0a9dce2babae61d528bfad01

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