Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3830574483a65c…

MALICIOUS

PDF

89.9 KB Created: 2021-07-08 10:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 490f1203d0be5773aa292a71dd153b44 SHA-1: 168d08fbd6f3a7daf10d669af82af47b400074a9 SHA-256: ff3830574483a65ca57ac5a0e4f5814f1f9861640228dd8451c9a19bdad7d70d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious URLs. The primary purpose appears to be redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=watch+the+best+man+holiday+full+movie
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076e9890eee9---bejovimepen.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/911b9bb64115726a6870c0284174d1cc/69918870038.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/fd18f94284bf8d9898cb63ea7af8cb7b/99670460480.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091df7cce7cd---40550066264.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d15fba36c8---kiviba.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/bc5a8724eb51e62f56884ff9d59598a2/wajunumasebonezumeruxapif.pdf
    • http://technocom.pl/editor/file/24351842922.pdf
    • http://cuatudongsaigon.net/uploads/files/25373206406.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/444ca6f98219f25a1ac26026c1153da3/nawozapeba.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/u2jl2s7ouqcv6lqddsdbmc1cp3/18271499142.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607070df41f6b---lemunijalabetajosexawu.pdf
    • http://kapsalonindex.nl/images/uploads/26462145896.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/ed506fc2cbcea903e32ba2583f8b6421/62957574729.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/53ba292f9f7387e9ceb87b67e8e810a8/92884585685.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/gnfst4gq3fve4v3cmr8t3smim4/74372505023.pdf
    • http://geometrarontani.it/userfiles/files/82427785009.pdf
    • http://szwygs.com/upload/xikezajes.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0cd2505c0---21003013693.pdf
    • https://rubenoferro.com/userfiles/file/nexijiwe.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ae1764c7a---85803621762.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6qicvlofb39566ia6solgekbq/paxesagifava.pdf
    • http://dyglas.com/userData/board/file/jegikufukadadomola.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/h0ts2fv678onbe48r0q71auukq/laxulaso.pdf
    • http://e1pl2.nazwa.pl/busy/fotki/file/kilubigogiloterugazog.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_off0000fb2d.bin
06f274ef6d92ed282e32fb8664db6616fa93a99aec8b77ce6aa40e031009226c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 16932 bytes
font_01_sfnt_off00012725.bin
7d1ab6fcf48ecc6f7f0f609b1fcca71b5cbbe9f125d8b6de98f166bade875eb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12725 11056 bytes
font_02_sfnt_off000140bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x140BD 16792 bytes