Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0bc098a2286c06a…

MALICIOUS

PDF

87.1 KB Created: 2021-07-08 23:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0f1923548d457bc340cefbd8344023fb SHA-1: 041a969509d55b753791980c4220c32b3a253df7 SHA-256: d0bc098a2286c06a3ae37a9620d7a46c277c60a21878472f4c2dba93d9dbcd85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malicious content delivery mechanism. The file contains numerous links, many pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The presence of multiple external URIs and link farm characteristics points towards a tactic of obscuring the ultimate destination and potentially leveraging SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://techscreening.com/userfiles/files/6387743451.pdf In PDF document text
    • https://alakharia.com/public_html/userfiles/file/79813926855.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609896b633b78---11186658452.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dda0c5555a---49125757337.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/lesuvobafonid.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/86103208106.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f70254ca3ec6ddf3a906e85c01324d41/xulidewabazunep.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160987dd999f8d---midatapufukikilulile.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/33pbntbdfd01qcgggt0fp68s2n/banopuwosidovepuxu.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/jufogovosemudakuribopi.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b11b3b3fab2---wewapuvujijotenerixanoras.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084e81266b35---lijoritewalidisidekiru.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160956adb3d1e2---gofedivanuveripepatod.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a21628583c0---49000467409.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/98p9sbgarcq3a70dp9i33426os/tezani.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/60929179891.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/dvoq3tjs3ope0uqacpvlfdv5j5/jetowiluxani.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/d4d77c3fc9813d30e08322b97c3626d5/fekuzi.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/5274ec9818a88e1dc2c83b53c59225e0/293714716.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/tufakoma.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/893d4578ae3dae9fd95ab9ded3c93bea/90528142654.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607eceffd93ed---87403159635.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/tunekanitiporuzofus.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160843d4926fce---juzedoguk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=grow+castle+tips+and+tricksPDF 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_off0000f1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FF 10724 bytes
SHA-256: 4a07e33a53ede6b93c0145b6830efe73ed98779ebc05cb33e974231299ebe39c
font_02_sfnt_off000122cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CD 16500 bytes
SHA-256: f4b6019b0efe80d2d22070724ab10d04612f8874677da1e4518bc84ed3290c28

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