Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8130ec6d6c777d0…

MALICIOUS

PDF

84.8 KB Created: 2021-09-03 23:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 458a6a7cea6758d32bc3a93dc30f6086 SHA-1: 860123e483b1ec5a10f85ca5dcf0545b5b52286b SHA-256: f8130ec6d6c777d0101036ee78b7f9b527a7cf06649847100906b5f3873792f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://nikoljski.com/ckfinder/userfiles/files/40478612440.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8d2d1e23e273ba96e11263f3f6b4b5bd/45775042966.pdf
    • http://royalrep.com/userfiles/files/54696257005.pdf
    • http://amandatravel.com/userfiles/file/gesem.pdf
    • https://somogyplusz.hu/files/79282207316.pdf
    • http://studiogeologicotrilobite.com/userfiles/files/kokojalaxofefup.pdf
    • http://mega-stainlesssteel.com/uploads/image/files/4837668585.pdf
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14636710781.pdf
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/41062091706.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/5f9e0875d9c9d6b5a7e3639cf23ae10e/lazasopiwe.pdf
    • http://mclarenquartz.in/ci/userfiles/files/27538802080.pdf
    • http://heninrealty.com/userfiles/files/wakunesazonelogasujanaf.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e2337ab365b54a378d72c7f617e30862/lubozobes.pdf
    • https://bgmediation-flm.com/userfiles/file/96659149196.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/cb5ee451e7323692ad4cff3673531dc2/soxawafiduparuw.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607efb3c654f6---86795350011.pdf
    • http://studioarchperissinotto.eu/userfiles/files/mepuza.pdf
    • http://stagelight.pl/userfiles/files/66978463501.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/5c7b13b84de55ae8958ab642f6b9285f/vuwopikakaruneduvodanego.pdf
    • https://emailing-online.fr/uploads/userfiles/file/susafi.pdf
    • https://xtrafitcoaching.com/www/images/files/kuwikem.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/56d1b5f6769ab1d148a01f2cb8139659/69282604115.pdf
    • https://grnca.org/img/files/files/17537645158.pdf
    • http://school19-zav.ru/userfiles/file/nixebigovuxajuriluvenebu.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/da5fc4fb0ad26a298e6cf44df3bc2dc0/31581695071.pdf
    • http://tpdw.pl/userfiles/file/10493317423.pdf
    • https://fertilizerproductionprocess.com/d/files/54493259610.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=palha%C3%A7o+gismonti+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_off0000d96c.bin
c845c3b9d0e8977cfbd4a79d530972c08a84cab3e13f4846148fc9c33ec73f40
pdf-font-stream PDF embedded font (sfnt) at offset 0xD96C 22196 bytes
font_01_sfnt_off00011298.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11298 16792 bytes
font_02_sfnt_off00012aaf.bin
fd7a98fdd80718fc8c32d18865ed6e46d5462d1d2601c09d7d3a7b542855a376
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAF 10912 bytes