Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af7a5c6d25c67d9…

MALICIOUS

PDF

72.0 KB Created: 2021-09-28 09:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6dc7707853a4f8941b88eda6d03bdf3a SHA-1: 268a9ab87c6e25157cc80371a57b7ba36ae1884d SHA-256: 5af7a5c6d25c67d97e6ad3d5767575c3899d0f1735d90d7ff801a80006ed6569
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of a phishing lure designed to lead users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147416f84b92---33690558745.pdf In PDF document text
    • http://vaynhe.com/upload/files/fazinupisezuligipumu.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/45385338382.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/xifonolakobebigajitimur.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/265df82b763ae245a2b4ef74bddc32b1/25154279445.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161511f802cb19---7107261669.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614822d716405---zinuperefu.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/59468573987.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/nogevenajol.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/mozaxofuwo.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/43804084465.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/68090447059.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/it7qs5d94pdephrnlnk594r0t2/golafepogaduk.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/62738966089.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/nodipikixavu.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20219131310356317.pdfIn PDF document text
    • http://dentherapia.hu/files/file/47425147302.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/60185643686.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/48802060341.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/76353129843.pdfIn PDF document text
    • http://domosplast.hu/files/file/18338693205.pdfIn PDF document text
    • http://bienbao.net/uploads/files/salelixedejegarozexadoroj.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/zaretelanopotox.pdfIn PDF document text
    • http://ave-france.com/pics/files/58116131985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=mod+menu+for+car+parking+multiplayerPDF 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_off0000b1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AE 17800 bytes
SHA-256: 9f8b942b4d9b78700d3d9df22bc00f7c4f2db7d19324fc21cdb5dd5ee6609bf1
font_01_sfnt_off0000df24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF24 11096 bytes
SHA-256: e48f4ea5a0e700394ea0f5e29849a421c41a3ba940e0511874f50543de643aad
font_02_sfnt_off0000f8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1