Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1d256553f25d28…

MALICIOUS

PDF

95.2 KB Created: 2021-07-04 04:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 725dd64db81718f6f7b205fb036fe9f6 SHA-1: fcc6495db77e87ae6569df69b74485b9c48b19f4 SHA-256: af1d256553f25d286c75638e3eba890173ef383c8f0c7fa9f24e460c2881da99
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, specifically flagged as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://askort.pl/Upload/file/33408881237.pdf In PDF document text
    • https://narimasu-chintai.net/jcfiles/file/41931137875.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a85c7d94683---rowatupawafejolemizubatam.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d9d0dfd69---wiwiladekebunaj.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/80339915346.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/dapow.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6786f26f3d---dosajewame.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/36661792686.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/755311489.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b180a604855---bekapipulazovapiviso.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03f1f0e58f---wufewamizitete.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/b0b65d1aff0a5a5647c56d283967baba/74384203773.pdfIn PDF document text
    • https://irantruck.ir/data/file/52369983874.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/tijixovogarebamotefarabaw.pdfIn PDF document text
    • https://bloomeng.com/uploads/22495100135.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/4s69phc1b0pkpg9057lea6igag/wiletedasaso.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/128c20461d04bfb68a050d79b97a9bc2/80793027087.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/15476303488.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609100fb1dea0---77203413652.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/vemubalavalagapaxezebise.pdfIn PDF document text
    • http://landpas.pl/upload/file/41600079970.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e7c69217a---vegev.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607272930269a---56961981500.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/65163543182.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802faad8c16---bovemena.pdfIn PDF document text
    • https://primer-spb.ru/files/files/zugenodalupojudezav.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/6a276863dfef38f4fbd952dfb76dd193/nanuxekikikugasibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=dollar+to+puerto+rico+currencyPDF 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_off00010e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E47 10412 bytes
SHA-256: 9ecc488ffa1409d6e1a3df93731e8a4a9bcefdd24e983511bc1d518113d55e9e
font_01_sfnt_off000125fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0E 18604 bytes
SHA-256: 7580ecb365ae246e6464927cddeec36b969e55cf2e3cc0f7d859ae7c3dd7e0b2