Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e598da4600c6a91…

MALICIOUS

PDF

92.9 KB Created: 2021-06-25 22:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40362f33399724bcf474c9277374974c SHA-1: 7d9a1b12d31254e94aa8a1f0eada3b9410da0a9f SHA-256: 0e598da4600c6a91765fa763ebd06c1d00fb7df04df4ab141e63296de879feeb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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=how+many+daughter+cells+are+produced+in+mitosis+and+meiosis
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16099152b5c41e---67466947733.pdf
    • https://pnlcoach.com/misc2/file/
    • https://torgradio.ru/new/files/file/97149406688.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa5bc54c8---fomovisexakowabowutixi.pdf
    • https://advance-pack.com/editor_upload/file/16975483882.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/1nr0b2v8lfcefldfb76tr61dpb/xifumezimesavilamanaluvon.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/fdd0mp9k0c4v5m59l2cq9he921/81992546664.pdf
    • http://angarakshaksecurity.com/userfiles/file/27817117889.pdf
    • http://ya-ke.cn/admin/upload/20209255358.pdf
    • http://ronaldtan.nl/images/photo/43445749420.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/31249678629.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/k2e1rjlvnp25u58gf1r9816uh3/kixilokebisajobawirotil.pdf
    • http://bjsprt.com/uploadfile/file///2021051920200410.pdf
    • http://esejsc.com/upload/files/87072734523.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/1b4821e98421847b155a77de6425948c/badazabazilisadi.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/fafc9e13a58b58bd2ebf4b2a57d27a8a/xaxumulivakumisukaju.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/rvhu8d3ug13g38fala2o4kqa01/58525428829.pdf
    • http://france-ex.com/images/blog//file/44978487982.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f842cdd2e2---57109619281.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc6e6d34d5---kogekuwizomat.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/42612b96e3b174e060089c4646a1431e/72520844917.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/rgadpupe8246glc5i2bvf3lr17/57949276981.pdf
    • http://vita24h.com/uploads/userfiles/file/95418354211.pdf
    • http://www.heksan.com.pl/file/tomugiwidex.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/bb6b33295deffd23a022aef427d823dc/83496017948.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_off0001090b.bin
c08f7aea0d06f279b9cd01c2a6324c8afae9589d2c8879fc1d5d130c9341a81a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1090B 11252 bytes
font_01_sfnt_off00012309.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12309 16792 bytes
font_02_sfnt_off00013b1b.bin
b7b486351ba6bbf8068e218f7bb7b997db9720a1ba5061cc608c81222729c8b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1B 16472 bytes