Malicious PDF — malware analysis report

Static analysis result for SHA-256 83febdca222d24e1…

MALICIOUS

PDF

67.8 KB Created: 2021-09-19 09:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c958d6941f962795fb8fe307dc919521 SHA-1: 648d253e76cb7c8b67f737e9bf45fd71a85d4bb2 SHA-256: 83febdca222d24e1ac2b9425e14f0df60b8fd2b474b6c78abcbe2859e4ed88e5
176 Risk Score

Malware Insights

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

This PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a single image, suggesting a screenshot designed to trick users into clicking embedded links. These links predominantly point to compromised CMS uploads and disposable hosting, ultimately leading to other PDF files, indicating a multi-stage download or redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ao0elhe9vtd0fe8gih42bd015j/kenitowe.pdf In PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/febimepewudiloxinibupani.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/42749921531.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/91428001485.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/buraxuxowotamejamo.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/22346268927.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614595173704c---44039549832.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/gufamakozavidodamu.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/nawonuw.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/2456924612.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/40340225634.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/vowivomu.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/rudejorivovukukuregetasib.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/6006511420.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161404a7f8907a---35750428846.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/32519894329.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/86697964422.pdfIn PDF document text
    • http://newcityhk.com/userfiles/sojemimasaderigagij.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/tapirokufakuko.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/61605017881.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/gebowamusujomuviweg.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/35968617144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=kodi+addons+2020+androidPDF 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_off0000b018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82A 13888 bytes
SHA-256: 6c8beddb30460cb481bcc66dd469c2ca9c47b5ab9718bf593c22cbb2c785da8b
font_02_sfnt_off0000ea8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 10200 bytes
SHA-256: 389f7dfec9c020e7bf19af5e9b95b48c0ae6b06dc565b0a66fc72f7d5b280c1b

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