Malicious PDF — malware analysis report

Static analysis result for SHA-256 b688e6a461a6e312…

MALICIOUS

PDF

91.7 KB Created: 2021-06-26 14:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8426b4e197e3fe0903fc3cf327dc2c80 SHA-1: 7215a1dd8c1323d60aaa7ba0680f699f11b65914 SHA-256: b688e6a461a6e31234782e35e8254aa81c5e21aff295960a68736eea2106d9e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs that point to compromised websites and disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution, which aligns with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://cructi.ru/uplcv?utm_term=parable+of+the+shrewd+manager
    • http://csc0516.com/userfiles/file/20210608155334_ls6uts.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1395bdb4d2---83006039081.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/cd198419639f3ad287360077137e4572/43148840349.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/sexedejisotigixeropumefe.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096bfe86b36b---48304229980.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/3d3148756bef5e9ed6130d93092a5520/lazidavulirisepimub.pdf
    • http://stlnsk.ru/uploads/file/10513371113.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/9b9df8b180531f2d1f41ad5adeec5395/zinalizax.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/hl79lrv608gfk7utj1neud7511/medikuruvitubujuxajoxopo.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/cd22561efc649bc470983a3933478c96/73508510519.pdf
    • https://ive-cal.it/file/5521814092.pdf
    • http://josephlillianmorrisfamily.com/clients/59960/File/73615936276.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/0e9fff2337c2f0038abcad0818f53292/lojujeliwimijono.pdf
    • http://alexlunacoach.com/img/editor/file/vunubamevana.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9b0604c8b---93052341830.pdf
    • https://barcelonacentremedic.cat/files/galeria/files/3111470954.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/af23ebef7cb7bf681c9f988a3e01c132/54246528281.pdf
    • https://suprizpin.com/calisma2/files/uploads/81533191947.pdf
    • http://www.awakohchang.com/image/upload/File/akinadaxebipuxomipomar.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/8jolcuvr2gia8lmsl4kol3f8n8/35018390653.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb06ebaba2---jikozikebovusexametafotaz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103b2.bin
a74e6362d744ce8699b4bbd0914242a555a60286eae9db13f19be341350d8c00
pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 10936 bytes
font_01_sfnt_off00011cbb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBB 16792 bytes
font_02_sfnt_off000134cd.bin
664a20ae647246185a3596ec9b36dd2f6742cb4bbf3b28cde3421fcd5c9a946b
pdf-font-stream PDF embedded font (sfnt) at offset 0x134CD 17316 bytes