Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb03458f8ae30477…

MALICIOUS

PDF

87.9 KB Created: 2021-06-28 18:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f4ae6e4c24bc6088a217016bd0ff42d SHA-1: cabb69d2b2625be187cb2eba49487bab541a0223 SHA-256: bb03458f8ae30477c5035530f5442af4c95dd03a981cc4830adf2fe45434dad1
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics suggest it functions as a link farm, leveraging SEO poisoning to attract users searching for game hacks. The presence of a "download button" lure further supports a phishing or social engineering attack pattern, aiming to trick users into downloading the malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aptchasers.com/FCKeditor/userfiles/file/demajematinifixomaniwa.pdf In PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/riwewewor.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/bs7cc8ntumktv9cjobf7ae673o/85727329101.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/clkhblpmcf8ls6dnjbcf4go71r/menurosowebukel.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/rilodilosoxajelubelu.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160867dfe98d8a---79812403016.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160939b2a941eb---nupupolerugovadifezag.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/52066157393.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/sovifetisagudobebokulum.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/55282140393.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/pusudoned.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075d47b13285---rurefinanudedit.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de54543524---26873729277.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf21f3e322---74484896440.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2df461a61---47102123485.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/b53d3c7f845e39beaca993692922ef47/jisumem.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4d19993fb58b67aecd6a3502de7c258b/jipodosuxoroki.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/nuzazadadineletakod.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/77768529560.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/35424e61e83894b9021196f63508ee47/24552937376.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/bd357172174d1c4c318d390f698564b4/lupufelezexisikejanek.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/23751621835.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ef331eec1---bepumidoremita.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/054374fe53c0df16473cf1da7203e2e1/81246793345.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871ca886d66---bugemo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f82218b2ca---suvaxoxibiletegixikema.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/52a9dabb2fe5c0f3e5e4e03b83f32181/gukuredozaponavobeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=subway+surfers+hack+new+updatePDF 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_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 11064 bytes
SHA-256: a9d86e4cf791b9eb5d1dd03ec3f396ad44410a51a3ba71118c44c78845f34285
font_01_sfnt_off00010e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 16748 bytes
SHA-256: 5bf63bfc2af63f5b6cd864c9cf9cb190913e28134a05c6dae47830ff9384a793
font_02_sfnt_off000139fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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