Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7fe1658bb827ab…

MALICIOUS

PDF

88.9 KB Created: 2021-07-01 19:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d4ee40f3fb560102c763f5d93fdf22e SHA-1: b87f6fb05dcc651d4b7a76df14fbd944abf4712e SHA-256: bb7fe1658bb827ab1f3e30f6e4ee193fcf6ad1cea8294b73b43e365edd9df878
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting domains. These links are likely used to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16f245158b---vupidegututoriboje.pdf
    • https://vestol.bg/files/file/10062529808.pdf
    • http://ubest.ru/images/file/42919889515.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2cbf0b331f9f17433cce3b1d71f47918/72419117102.pdf
    • http://chalappuram.com/userfiles/file/kivijulu.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/8c6d59242fd641f080057c5aa9316934/faduve.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/363qc7m81a4kf5rav8sllduu3n/70350966891.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff76b09988---rusukapetej.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/16f8de2b71e6c1fe338b9d68c6b64204/90768051585.pdf
    • https://responsible-tourism-alliance.com/content_file/files/nigubad.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086942ad8fb1---fezejaxowomarizenilowovud.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5185041cc---gafeduzumezapifepomewovit.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/uojbmnfl01g9uq2htbcesjt7i2/runowisemixudavisovaviv.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609dabdf5377b---woxogikanisonide.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089d92bc1b89---pulixuxunexenu.pdf
    • http://asea-admin.com/_userfiles/file/20210515211925.pdf
    • http://mosjob.ru/images/file/19956016745.pdf
    • http://guojingmall.com/userfiles/file///vifoxegowazukusifuzokegur.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7b484901013e081a9faf6e91d7a4b8a7/sekokegakenizo.pdf
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/nimowevinogabebo.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc5a0bd5c2---korisemedum.pdf
    • https://rlmahtani.com/userfiles/files/zidagamele.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+do+u+lose+belly+fat+overnight
    • 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_off0000f7c1.bin
311909889687e2a6fc6703f15791d5638121701c26b083918acbd975ee42bfbf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 11128 bytes
font_01_sfnt_off00011182.bin
1310d6e5e67b9e19d47ba0d5674ef18186830447b9dbd4426885ffa7094c5a3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 17132 bytes
font_02_sfnt_off00013e20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E20 16792 bytes