Malicious PDF — malware analysis report

Static analysis result for SHA-256 8699900d6ebc2434…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 03:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d4e636a53b8fe7ff64cc986e1908d930 SHA-1: 34f5808d87ca6a72693e72ed1c231f2c35662f8d SHA-256: 8699900d6ebc2434e4e46f377482e2edce1fd4e296f7e0911c93bfe4c205d46b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains numerous external URIs and link farm patterns, indicating a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://ketchas.ru/uplcv?utm_term=meaning+of+curs PDF link annotation
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/clse904u0vgpqq52da1v5dgl1d/35358824586.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1f93106a0---32878728176.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfca3819708---supesi.pdfIn PDF document text
    • https://medtek.vn/storage/file/45245662277.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/8361174153.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/74978831037.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebadaca6cb---rokejaduzizejowedok.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b4a973d6f---vafusujajopitexemo.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/ruwopenitirakuroji.pdfIn PDF document text
    • http://belst.by/upload/file/28331160673.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/rotutekabokasa.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/jeahd65cftdkg60ms5rp4e3vp0/roravasebe.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/15919235531.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/fakefodido.pdfIn PDF document text
    • https://ovalpolycoats.com/media/somezugudetewinog.pdfIn PDF document text
    • http://sinoorchids.com/image/file/14488772339.pdfIn PDF document text
    • http://mfahk.com/upload/files/nakuda.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/mifadamapilufevarugopexe.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160804b8f8130c---51568260618.pdfIn PDF document text
    • http://kgmda.com/upload/files/forimewibiwebugiwifona.pdfIn PDF document text
    • http://cy2hand.com/userfiles/jumidivixererigudol.pdfIn PDF document text
    • http://martonelektro.hu/files/file/denilisu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffbdc7b43b---89018806413.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c368e8b35c4deffc50b08de98aca98ab/56288194760.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081e1078719e---wiruvage.pdfIn PDF document text
    • 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_off0000cd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3A 21880 bytes
SHA-256: 162a0c7ef3544e2f77ea96c3ae526b0d6943f1fc1b7703e88126b0d8f7dd4135
font_01_sfnt_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA8 10460 bytes
SHA-256: de1fe5223107c57002fe7b4ec4a78a5b7ee8dd6e112924bba88bf7f00d7511af

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