Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de8072c42e2b8a2…

MALICIOUS

PDF

83.5 KB Created: 2021-08-30 20:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5cfc66a9f958bbea2c5bd07d8a467c3e SHA-1: 99abc2ebff0295f8e019bdc25de6960ded03282a SHA-256: 0de8072c42e2b8a2d11b4152e20dadf2b7dd30908b1b93352b57ad39dd25d06c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, characteristic of a link farm used for phishing or SEO poisoning. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://indago-rovigo.it/userfiles/files/64349830784.pdf In PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/b1fmccq75a76fcqrjrjvcfr87u/68576712551.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/61644285899.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/fezetoguladefemox.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/wupegakojosimuzigaja.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/8133295841.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f305f0958b---90504666671.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/61516035918.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/xirexelanijowuk.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/jiganugotitonegavidalupo.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/f73bc1462c5a50de45444b1c870563a4/1080413405.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/18824407366.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609687f7f3b7e---xuvojusotimuwezapika.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d61770cd86221c444b310c0ee5aa29a3/votuwumaxamalewiruwisa.pdfIn PDF document text
    • https://kede.org/userfiles/file/maxaxatanitixoveze.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/42699713743.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09d07e2e48---xowenatafekenol.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/79297476673.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/xadomozo.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/a2i41j3t6csftjbh0h4n3s01v2/43856649354.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/movarajogut.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/99822386788.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a098ac2d021---nixetiwikuzebaxunaxikulon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sum+of+normal+distributionsPDF 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_off0000d9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C3 10700 bytes
SHA-256: ba1d7fd77c4a82daadc36f94a6056b3535c004780eb14d23a5cacf1da288518a
font_01_sfnt_off0000f237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A49 20400 bytes
SHA-256: 145ab56d46a6aca7ca508fffaaf17554c205b5571513bdc35dc9d61584683c85

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