Malicious PDF — malware analysis report

Static analysis result for SHA-256 506883afd6143efb…

MALICIOUS

PDF

89.7 KB Created: 2021-06-27 07:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5adcee27cc4b98f1dcb643aa40c878b SHA-1: f634c2a93e82d9bc16f2234ba840700866e5d6c0 SHA-256: 506883afd6143efb7b458d4ff28ec4addfe53348d45e101d5a88c3b0ff8ededa
204 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains a link farm pointing to compromised WordPress upload directories and presents a visual download button, suggesting a lure to download a payload. The heuristic indicating a password-protected archive handoff further supports the idea that the document is designed to facilitate the download of malicious content while attempting to bypass security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074368f16553---vekunepugelokejiponaja.pdf
    • http://bannermaul.com/userData/board/file/32608566084.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aea25aec90---19026823039.pdf
    • http://broadmoor79.com/clients/864886/File/13367288951.pdf
    • http://velo.hu/UserFiles//file/279772928.pdf
    • http://31kouqiang.com/userfiles/file/1624422216.pdf
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/0t89aiedoh31ml4v67p923n576/vapevedamupiniwinula.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/379cc2e3106884d8aa699007fe8fbe8f/47800914993.pdf
    • https://holocaustresearch.pl/nowy/photo/file/fedululopumanezigogi.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b244d2dd319---61253670010.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/bf7d2ae835df6d16e6654371b4bd9591/nudulogibolinuru.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afef548c72---xujagenebijovag.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f90581af1---mupariguvemifar.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/i6gpnm97atccjkgnrd1qssipo2/suvuzodizegunowoxolo.pdf
    • http://bebelino.ru/userfiles/file/3717756636.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608520eacddf6---83381350022.pdf
    • http://loveperfectionschool.com/upload/file/60655841773.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6265dcb16d8770b7b7f56d056da7e1d7/16185886937.pdf
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/97391178894.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b33b2b0b9---11608664346.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0ee5ae0b2155c8fa2bf57f67ace3d03c/15429957289.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/novibidumujifasojubu.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071946e763f4---dovelajudirelusuda.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c060008e8bea0646f5f85fbb34ec8ce1/rusuvoxivonadosizuwali.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/a1417fe66ec849e0ffab6ac24712975f/bajozonafafetago.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=download+gta+5+ppsspp+iso+file+for+android
    • 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_off0000fa14.bin
4af4c438db64ed442e19d6f95113c7a21eaa7531b9df8f0e3bdba7627b395775
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 10896 bytes
font_01_sfnt_off0001134a.bin
b9370b829013ccaaa26dc1baad483b5387be6507de72b2f208dddd8de7b1e07f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1134A 16924 bytes
font_02_sfnt_off00013f8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8F 16792 bytes