Malicious PDF — malware analysis report

Static analysis result for SHA-256 153b0b03d138cf96…

MALICIOUS

PDF

92.2 KB Created: 2021-07-21 21:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e26e8e7748fb7a6b9d2530215a2ab21c SHA-1: 5af58437ad01c90ba69fa3406f321f5f0737da85 SHA-256: 153b0b03d138cf96cdece304a9aca656a7cb0bebac3f5fb62d65633e3311f227
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external websites, some hosted on potentially compromised or disposable domains. No scripts were extracted, but the structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://cairparavel.ro/app/webroot/files/userfiles/files/jibakijil.pdf In PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/rebaxose.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/zukafifekomo.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/jezavajajuforozifa.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/6a182065452c392dc6883cc5f9ffc4fd/44424489539.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/8i8ama2rln8trjkbip844iiaou/zadasoseralizanidifareno.pdfIn PDF document text
    • http://kleiberit.ru/files/file/99388357055.pdfIn PDF document text
    • http://babyschultz.com/clients/72285/File/kogodabupomegusejobime.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/pivik.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/45574252293.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/f9711145f4f6fa692bdc30dc5964dcdf/zazudejowetowuwodiwef.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b55226ad5---64451365068.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086ce39a8241---selorubemajodawar.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/f378921ee19e7ce318dcfa4052ad1432/vupatovovepobisamu.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/u2itqlcccfl41jafbap66445gi/rodomojofuzowalejapan.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/992dd570275a554c47b4685a2df073aa/gipulamopabejedud.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zorusewizes.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d03a9e0ab0---tovawaraxadisa.pdfIn PDF document text
    • https://aashianarealty.com/file/mevinetasuwo.pdfIn PDF document text
    • http://ruresept.ru/files/file/wezujuzogufimukedinolodiz.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/54002221154.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ta7mn5f5fhq7ln614qipkqbui3/97804049442.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/16fa4cde0a29bf62220c50b4a049c233/97164254162.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/lulanitaxumen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=acid+base+and+salt+class+10+questions+and+answersPDF 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_off00010324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 17468 bytes
SHA-256: d9c167b4a9b871bd9d49b56fc3f794c31e1029f2d60b6c7658fbb563116a68e9
font_01_sfnt_off00013058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13058 10992 bytes
SHA-256: 89fe400e34a3270f7c314bbe1ae4c67a2268d43b8bc9bb7203718e5b98c0aad2
font_02_sfnt_off000149ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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