Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0afe46609b68f8b…

MALICIOUS

PDF

77.1 KB Created: 2021-09-18 04:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 70a1d2419ebde682ba97af3e6ceb3b25 SHA-1: f6fc816dd6719a046c6b5634a317a928f520d108 SHA-256: f0afe46609b68f8b7df2fc0e66abf12714ef799ad20c5d1476cc93b66faf0190
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests a tactic to obscure malicious destinations or leverage compromised infrastructure. While no scripts were directly extracted, the nature of the link farm and the ML/AV detections strongly suggest an intent to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://hijoin.hu/editor_up/xatodebisefofotakax.pdf In PDF document text
    • https://ms2oke.com/contents/files/18561090688.pdfIn PDF document text
    • https://efnnma.org/files/file/wugewifazowera.pdfIn PDF document text
    • https://kimcert.net/E/file/tuwabefidorejozef.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/mavopibofomuxinawapekud.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/tusawajedo.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/80284670519.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/rujunigeri.pdfIn PDF document text
    • https://lux-ride.com/home/u4-6pzgszajsb5u/www/lux-ride.com/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/42239192203.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16143ad4502967---gikajazurexitun.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/92387022117.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613346ed9f59d---xijefom.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/35186641571.pdfIn PDF document text
    • http://htwy.com/upload/file/27363731636.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/75371478403.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/59041993375.pdfIn PDF document text
    • https://pellevah.com/upload/files/didixilof.pdfIn PDF document text
    • https://electroagro.es/pub/files/61005863133.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/mowidikupuj.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c47633d0e1---lupudetonuvoxotizumef.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/votifikujulisewunugoga.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/7810214431.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/rawep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=dragon+city+gems+hackPDF 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_off0000c855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC855 10836 bytes
SHA-256: c14f08002498b05701c8a012276d8ed769775e684d2de5eb4d3380c353187cf7
font_01_sfnt_off0000e12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12F 17792 bytes
SHA-256: 7c17de313b97a0717301e753a9fdf5da3be173612c11c421539b4e03ee5bbbe5
font_02_sfnt_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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