Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa8e56f5f253fea…

MALICIOUS

PDF

76.9 KB Created: 2021-09-01 20:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b98e2c4463a137cb490b6ce931fbecb0 SHA-1: b7a2c700a086f2a91730f1d7114aa1a61f2cfe46 SHA-256: faa8e56f5f253fead2a62e247f7c88b3a401a3bbbd85fafa66a827569bec392c
196 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The primary attack pattern observed is the use of a link farm to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://cantellodetersiviprofessionali.it/uploads/file/71800433527.pdf In PDF document text
    • https://kaktutzhit.by/uploads/files/kivetegutazitejunu.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/d7f66eb3ffdd748cc80d945003225e60/25228533864.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/pevuxapodegakul.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/nibikasikexubitezumuk.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/31079793641.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/99035058323.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/34058348884.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/kowuxuxiv.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/e8ebcd880587e5b649bacf3e1fab8530/45953613944.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/liditedinojij.pdfIn PDF document text
    • http://cochu.net/resimler/files/22262776726.pdfIn PDF document text
    • http://hydrem.ru/images/file/dimagugewonejoravobagusi.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/14jdn2tfg5mjhh8m6n22e0qr8e/63203133025.pdfIn PDF document text
    • https://fptica.ru/images/file/jamumaruwox.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/xutabokax.pdfIn PDF document text
    • http://carszana.com/image/upload/File/19899460148.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4671c6d588cc02913ca70d7b9aa0d3ef/49862103516.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/danejonojikijubefafu.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/jupotu.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdef10410b---31280812535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=looking+forward+for+your+cooperationPDF 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_off0000c615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC615 10928 bytes
SHA-256: 969ca84786e8c48332368a23d45a141ce10ed0e26513969d07f1edda5afcbbf8
font_01_sfnt_off0000df6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6F 17616 bytes
SHA-256: f5577dc8c866ac8412199dcabf22952f39d86ce84d025ee64a3935a9b564498a
font_02_sfnt_off00010d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.