Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9eaa68f32d214d5…

MALICIOUS

PDF

76.7 KB Created: 2021-08-31 13:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 058df0cfae5ab6b213587d19901ddc2a SHA-1: 6770cfe922018dda6f15364c3705447173f90c8a SHA-256: a9eaa68f32d214d55aac3192f7eda9bd062755abc72804abc341d94017cfbace
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://hutbephottaihaiphong24h.com/upload/files/78634846237.pdf
    • https://relaxbotanika.cz/ckfinder/userfiles/files/fubaz.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95a7f4f88b---juxubitukopilolivuze.pdf
    • http://esipro.fr/userfiles/file/xigibunasefopom.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd1a6eeab4f---tokebebukegegoradutad.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fbf6cd191---43172911515.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/b027aef645185d86ad70c84df75cc62b/80686258519.pdf
    • http://occahomesearch.com/userfiles/files/41786288495.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/8e5f51c957463f30d59021e6d79fe8df/26906865604.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfb86d8d08---21840627564.pdf
    • http://dbhsreunion.com/clients/21010/File/kupezeki.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/6ad8c1a92d3f7290615962a94588e794/selusanugipolubijuvexu.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085c804341b7---19373394889.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/219be9f147428dd21fc4e1ae336affe1/rubawikatarusa.pdf
    • https://annekienlen.fr/imagesfile/bimeroboduwawid.pdf
    • https://airshow-bg.com/file/wesexovenewoxedasakun.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/50f21ae079f949351faae9275cbba3fc/88700948524.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/8vlrmbvo0dvg3l4le4c2a8alo6/rusepolerokosusadopujuz.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094df196962c---zamobijovafozofagegimu.pdf
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/80415966151.pdf
    • https://farmacieitaliane.com/documenti/file/79570503689.pdf
    • https://lixtech.com.tw/ckfinder/ckfiles/files/63581651399.pdf
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/dacba5bcc9ccc93617863eabb0edb77e/xupakizurosani.pdf
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/6950938836.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=function+of+glomerulus+class+10
    • 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_off0000c5ba.bin
ba01905497744c8eb97925dcc1f31e6a46cd72052c250167622bfe2532795e10
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BA 10928 bytes
font_01_sfnt_off0000df16.bin
dc9169320fc9c2bf49c7da521f8f2625d16323b5518d75cf8e410c3f404b42b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 17400 bytes
font_02_sfnt_off00010c91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C91 16792 bytes