Malicious PDF — malware analysis report

Static analysis result for SHA-256 834a2729f83135f2…

MALICIOUS

PDF

70.8 KB Created: 2021-09-22 10:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c77d323e8c0732cacdcc5e76f77d1bbd SHA-1: 246c24f5be003a2dae953edbe10cf3876722defe SHA-256: 834a2729f83135f26551c7803ce662f6bfff0c9b0abcc951c85a72e11f01abd4
216 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, utilizing an image-based design with clickable links to external URLs. The presence of numerous links, many pointing to compromised CMS uploads and disposable hosting, strongly suggests an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit user interaction via embedded links, likely leading to further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 70 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://pixomot.ru/uplcv?utm_term=subway+surfers+download+hack+apk
    • http://groupkaishan.com/d/files/92579113454.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614166b5c3e4f---tuminemo.pdf
    • https://transturist.ba/ckeditor/ckfinder/files/files/34844887993.pdf
    • https://hojoairport.com/images/file/36261897906.pdf
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/gapinutizenigirodum.pdf
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/jelaverukob.pdf
    • http://soc-in.com/data/media/files/26121328144.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a22b497f---guxavafefimedolab.pdf
    • http://sbairs.com/datas/files/92875021429.pdf
    • http://hongdacable.com/d/files/dodalejuriko.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447d58d2c53---dulipaganilovikotif.pdf
    • https://dolphinsolutions.net/ckfinder/userfiles/files/sifuzinagalisafuvo.pdf
    • http://peterpan1996.it/userfiles/files/nesunukagezeratuvanu.pdf
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/14636760378.pdf
    • http://aerotechgroup.ru/img/outer/files/46569929671.pdf
    • https://preciseenergygroup.com/media/51073225214.pdf
    • http://altadirezione-consulting.it/userfiles/files/19132555815.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/u59c8fhepgdpe00nbp3r49dfb3/kuruxujometap.pdf
    • http://yigang-lin.com/uploads/files/202109032125037614.pdf
    • http://suachuaspa.com/upload/images-content/files/88132018276.pdf
    • https://henseltech.cz/userfiles/file/muzifomasig.pdf
    • http://cravaluos.com/ckfinder/userfiles/files/tatabagepapemiwuwo.pdf
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/35463588157.pdf
    • https://vico-real-estate.com/ckfinder/userfiles/files/wewadujeranusivunadag.pdf
    • https://cambodiadriverservice.com/userfiles/file/52670993198.pdf
    • http://1qjd.com/upload/files/2021-09-12-13-25-11-CkWTiI2x.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7f5.bin
ff90c74b3b4beda0aca18d0d137a4a8e7125ca25de743944f82888f20798892b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F5 14212 bytes
font_01_sfnt_off0000db25.bin
b6b7d6d9b34afef54e81547c6df106b4c0d14b99774173e4d0a49e621485691f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB25 11136 bytes
font_02_sfnt_off0000f4f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F5 16792 bytes