Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e74ad2327de8fe5…

MALICIOUS

PDF

73.9 KB Created: 2021-09-08 02:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 99d1409075c695d0f28bf9abbb8ad0df SHA-1: 870964cacd495a222b45e5f282c5b736af3ea53c SHA-256: 4e74ad2327de8fe5ee5a41d33349d7256dcfe345e3bac406f6703030eb2a092b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are likely used to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/60fd6fc4ccdd50775d0ece72712798e0/50535700451.pdf In PDF document text
    • http://fsoa.cn/userfiles/file/lowopuwemolododo.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a82a4cdf837---6434150922.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/jewafisikebafimotat.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/28311087697.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/jebuxedikebafibor.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/70759171205.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/9861e19c3425260bb7471806227fd0e2/jubilusadofurojifevonax.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/d555a497d6f1f5092c6140bf8fe30bf1/fusimoboriwatepeveb.pdfIn PDF document text
    • http://ladue69.com/clients/876446/File/82146351030.pdfIn PDF document text
    • https://migger.dk/userimages/file/98886925575.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/sosopekulofinexopurin.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/pebuzuxabe.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210616132200_5escgg.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/rotijotanuvegeru.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/wedis.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e99726407c---lilemibirubajesawen.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/0533820301.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/982fa8bbbe63cd0840cda3b93b04ceb1/67909837299.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/20159505475.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/f52b38ea6b460dc68e5c629a77c26a31/6689136698.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/savokugefaxirar.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bdff4df0c---44665612347.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a625bcc7fa9---22056815686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fossilization+in+language+learning+pdfPDF 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_off0000c080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC080 10812 bytes
SHA-256: 406519950a926f8d028635c4313843eda795528454e15027f34344c2bcbf6604
font_01_sfnt_off0000d957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD957 15904 bytes
SHA-256: 8ba5d2fd077252c5a5f43913c9926a8cb6bddaa38862526637a2a3bc4d91cb3b
font_02_sfnt_off000101d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1