Malicious PDF — malware analysis report

Static analysis result for SHA-256 4164faf1c47d362a…

MALICIOUS

PDF

79.2 KB Created: 2021-09-14 13:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1458117fe4e33004586962c4d72f15f7 SHA-1: f57409bcdd53d465e7236c2ea79659302a3a1bec SHA-256: 4164faf1c47d362abae37733689d46587d19c80b8a17959153b7c6e59da7b608
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing attempt disguised as a job acceptance letter, likely leading to further malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3b7107aa5---61769452303.pdf In PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/bijoga.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/82102405077.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/5877273946.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70770352278.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/xadedopowunarelawafipen.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/95212880640.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/54714166542.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/dugowobuzokakas.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b6736662e4895737468b032d32c12783/jebitolobowebezule.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/xizaf.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/bedoverunabovefozonixi.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613902636d9bb---48080574011.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021961732302104.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210906073002.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/mivonafojedel.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210913165013758174dzbhm.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/togajuriwelorevagefop.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/rumepiwasopuziwo.pdfIn PDF document text
    • https://people11people.gr/uploads/File/ditaxirosoborobal.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/54414880750.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/64191805935.pdfIn PDF document text
    • https://wecareprogram.org/images/file/30253141142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=job+acceptance+letter+to+employerPDF 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_off0000d577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 10520 bytes
SHA-256: 2a49514d51e7a5462278644d097bdd832970dac7b1a32fb34570700a86910e49
font_02_sfnt_off00010559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10559 16296 bytes
SHA-256: 7824798f2b6ad632fc4a238e7fead25913c059d466cbd22855e9f48c27a4b43f

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