Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b26d80f25fc2cd…

MALICIOUS

PDF

96.9 KB Created: 2021-07-21 05:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f22a68e3ec25e4f65ba7953e75c30fd SHA-1: c0768a91376fc69478b5a0edd7279c6b1aeea5d6 SHA-256: b1b26d80f25fc2cdcef5ff1f7fc7e553dff80c826cafe46ebaf3f37f74421c54
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised websites, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL heuristics point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://fruitofthespiritcatering.com/clients/9/9e/9e5e3efd27976f294ade36eaf76108d7/File/purafaxosa.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c392d2827b---752273334.pdf
    • http://www.siposferenc.hu/html/weretolijezagovozogegopi.pdf
    • http://elijasprojekts.lv/files/file/dedivamasugos.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/23107102725.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/3oqbpv9s05lv7ll8v49cprgbn9/livorodinasigovaxaresafu.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/01b86c41e2bc0df5294b61d0582268ce/7556603760.pdf
    • https://summit-christian-academy.com/scauserfiles/files/kuleluwizimem.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/kp0b81bdig040evvrk9dtm4q5u/tisurapiwe.pdf
    • https://damiel.eu/userfiles/file/zojakamagipowuz.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083056ad285a---51812476324.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4505f165fd---39035213864.pdf
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/36562876676.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160758c4a328ed---kivujisumajig.pdf
    • http://csc010.com/userfiles/file/20210624023231_vmsx8h.pdf
    • https://arredamentigiacobbe.it/file/bamiwegumuk.pdf
    • http://kaies.net/upfiles/file/37234038066.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/1a41a9bfcaf128830ce8673e2ba09d2c/fomorigimokugejususu.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/78d3a1663f38c695a89b91e8dec0713e/refiravoname.pdf
    • http://abwingsva.com/uploads/files/14014027046.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/3e9be55ef767a643e45117ed3cef0c8e/fujoronekatubazexegape.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/a26d1416f08f46c205694dbfec0c8932/8835640820.pdf
    • https://kaptenhoki.net/contents//files/zixowewijokedimi.pdf
    • https://brod-plovdiv.com/images/48071103986.pdf
    • https://nhachoxebus.com/upload/fck/file/69714650278.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=recommendation+letter+for+job+referral
    • 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_off00011aae.bin
7e048ed873e23318176e749fb016877a999c55297a3262aa84ec255a4e43beba
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 16552 bytes
font_01_sfnt_off0001456a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1456A 16792 bytes
font_02_sfnt_off00015d81.bin
cea2c3145ee5de492ce65195a85b5ad6e1f6e925403251881b9c1e0c57c2e7bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D81 10784 bytes