Malicious PDF — malware analysis report

Static analysis result for SHA-256 8028ae678c522d81…

MALICIOUS

PDF

82.2 KB Created: 2021-06-28 00:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9791c18cd45097791bbaef5c6b34459 SHA-1: a3e3c75c3ba0c1ceff6b34cce865095afe98a401 SHA-256: 8028ae678c522d8152056e06c62a875bc41c9e768753fe97b4255d945f68a945
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting it's designed as a link farm to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the presence of multiple distinct hosts and the nature of the URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://queure.ru/uplcv?utm_term=contrapositive+of+a+conditional+statement
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865e514f051---74873043147.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a0b0688d80edff9effccb7f2707eb61f/kasamifobekaluxa.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2dej45fd06tsjrecpf7j50lqv0/66806695782.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/77a3f1b893b9cc46a7bd7ad4192b1042/makuwasosenase.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803736d6004---38878678514.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9d5b5c068---319198742.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/sudisegezejozanomemorij.pdf
    • http://www.jindatunnel.com/up_files/file/zelipusabowuxajanek.pdf
    • http://lavalnerina.it/userfiles/file/39614537135.pdf
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/62892358715.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/nsa0fmcinqji5oupllrku2j2f4/57695134253.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b93bc60d6---degarimafijufapuk.pdf
    • http://www.emailposte.com/pictures/mabirusavonoboniko.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba1c1f551---koduvuz.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/72f3bacae94f500f1d6e48d12a7e1b45/kizodez.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607563cad3cc1---23059323515.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b92018e42---segeji.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/126556b350a08e807e23415e73373d7b/62957381028.pdf
    • http://decaiyun.com/upload/file/210618092432373061y95teti27gzo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9f1e3da4---46830170269.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/fee9f98487e35ebf29504133a9df8ac1/zejojowubukifoxipeguzutog.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_off0000db15.bin
5f98c2d4e2fcb54316ca0228b2903479ea72ea91253c6cb5b481b253f9855479
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB15 17940 bytes
font_01_sfnt_off00010a69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A69 16792 bytes
font_02_sfnt_off00012280.bin
7acede144c87c3c0da8ca298ecafb29065b708d33697b745dc296a6256aac717
pdf-font-stream PDF embedded font (sfnt) at offset 0x12280 10880 bytes