Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9a1ba5898817de…

MALICIOUS

PDF

90.4 KB Created: 2021-07-19 14:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e0a39343f351cf765ee9f04a21cec225 SHA-1: 17267276fa5f45b5f3d7a1fffe098e5e7cbc6412 SHA-256: 8c9a1ba5898817decd5dc490125d788efcd689a5f9a9fa459288e83be6cc0aac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to lure victims to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the structure suggests it may leverage embedded JavaScript for redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b899138ad10---zipaxobaxe.pdf In PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a450842cbfe4f8a164c82f80d9748921/lotok.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/23225336022.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/4ac227cfc01b7c7b12973084acf36ac6/gigenowisem.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081eafa028d3---timujorej.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/bipubuv.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/luxijaxexowabumip.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dfdd20370ca---8485631864.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/99896fd754c1a339767e83bdf42e86bb/dopube.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/065d41ebaa12af54fdf6aeb0706090cf/tazajarejidimim.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1bfddc05cb---97885813151.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/77199810022.pdfIn PDF document text
    • http://stonebreaker.at/66564035971.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/15504567690.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4db282c6ea841c39d1f024c1a00d71fc/27158561206.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/44842578913.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856621501ff---17478807333.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfd869f28d---tabekasugurikezi.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bcb865a7f---49879251493.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/68312971680.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089c143e38d6---xaromomuvepowoje.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/1d5038dd21e37d1bb17ac8d25dbbc2c7/purakijul.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/xotowufunoweg.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/vibamowexiviruto.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1f436ad5e---90036647572.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160722e038f657---98139231839.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2020.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/kaxej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=you+shall+go+to+the+ballPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE31 10312 bytes
SHA-256: 0d9a0aaf5709ed3eaa4bd391b7918b588ec65d062a6e202199713283d6a91ac8
font_01_sfnt_off000115a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBA 17872 bytes
SHA-256: c91481c5ab03ff0a8e02211edd706ec498f96db5aa9232b8b386bc2df4529d9c

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