Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db2a28f992c2c11…

MALICIOUS

PDF

92.7 KB Created: 2021-07-03 00:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e320cdb72d6dae432b253aac69aac36d SHA-1: 4f15f01d87706dd2e2ca377807f719dd80120fc3 SHA-256: 8db2a28f992c2c1169ea52a37d007cd0621159010c49b29c53ae6ab06157934e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://medvor.ru/uplcv?utm_term=it+looks+impossible+until+it%27s+done PDF link annotation
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/di3hvbb4fe1ug9rn1n1qlhd1t0/1387375122.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/pikosomazaleku.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726e0a93ba5---42056765822.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/42505661873.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/bigezefusomatap.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/59781143509.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/hi4eaav0vphsn2ru6unfhqjscl/zafitolejanevinifima.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/lisutevesifasufupotovutep.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/12421178837.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8dffdcad3---84781198694.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/wefujuzite.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/a7fbcc1bf66d1a2b772c57601307af10/2941197611.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/puwidu.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/u0cedicfajl6ouag35msld8chg/54758195055.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1648d02d86---89015280146.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/uzedaxepewoxut.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/naniratilodotore.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8f9e46ec454957ed3f24f8748348c1b4/xovopok.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a48250204d7---32154412337.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/53586629692.pdfIn PDF document text
    • https://stopserv.ru/files/file/zibitixaxigojuk.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/124f3847bda335b49aeb8810ff0488b1/nuvunaputikudejas.pdfIn PDF document text
    • http://garderoba.sk/images/_file/kujexizawajop.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/tivibotoku.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/3072765910.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_off0001092b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092B 10608 bytes
SHA-256: 68b6a4ca7fd41f9635ae097a60207f0168503c74bce205ae92121b591480cb2c
font_01_sfnt_off0001212a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001393c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393C 16928 bytes
SHA-256: e188be37792e9d264c7e488d13cf9967a77416dce508de3b164e7cc12d626438