Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3414f2356be3b1…

MALICIOUS

PDF

85.3 KB Created: 2021-09-21 00:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c80cc9d4cc0ea09588663fde7ba4830d SHA-1: c2106f63238359f194b3816359d05f6683c3d7ac SHA-256: 1e3414f2356be3b1daf84297b5219941121081b87ca6761f3256336eac50cd63
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ps-chiptuning.hu/userfiles/files/54197047460.pdf In PDF document text
    • http://ned.ru/uploads/files/nusuwitigenipojanibik.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138645c712ab---98418139225.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/22374817608.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/menivobodotinosidubemuw.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140bdd712d92---4366668966.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d1fd4aaac---buvut.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5af8d1fea---44886806358.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/35376233450.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/gonaga.pdfIn PDF document text
    • https://nasikampung.info/contents/files/zifot.pdfIn PDF document text
    • https://bursac.net/userfiles/file/bubazavuposebaxew.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/29e7c743c40d09ebb0aeb99cdd7bce5c/tuwunozipasajinefirege.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145591a25a06---72864018066.pdfIn PDF document text
    • https://fishuntpesca.it/file/botiluvam.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161445049e633c---26489850285.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109120611411086.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/suwiwoluba.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/71218779547.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161408cbc4c8a8---kosojorotameve.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/10360345053.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/gexabagawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+text+on+android+phonePDF 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_off0000ea02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 17620 bytes
SHA-256: a81c2dfc5ffd5971f02850f9786d531f262939a64f363163a301427834e73402
font_02_sfnt_off00013023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13023 10452 bytes
SHA-256: 4d7cb18212acb2323ee205a37f0fe9d26097f1eb83b2ff819a0f82db7bf45103

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