Malicious PDF — malware analysis report

Static analysis result for SHA-256 afbb6bc3642abcb8…

MALICIOUS

PDF

90.5 KB Created: 2021-06-28 10:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bce25cef2712c751bb8132079102fb61 SHA-1: e9627d12c078717f4a3d89b9e239e94ae3dea8e0 SHA-256: afbb6bc3642abcb8114cc575c41258ee1ee169bc406ca62b8fcd9069230d72fe
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary attack pattern involves luring users to click on these links, which likely leads to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/6347c2fdb3c629f16e42950ef5aa3131/70569028874.pdf
    • https://giasusinhvien.net/upload/files/sapivuvapawalozogam.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/e93a7cc2ada93538fd4b83085e36443b/ruzowazobojoliz.pdf
    • https://cncunse.com/d/files/38328724339.pdf
    • http://amoy-art.com/Upload/file/12744646367.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dfb523329---javiditazeliwanuvewazunun.pdf
    • http://bukharasuwanee.com/sites/default/files/file/fivozulelotimirobo.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffe8cc57a0---fikupifejekukap.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c6378f3fe---49581286071.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/2lfj68dj4ltd7dfgd9l01u97c7/40666830952.pdf
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/14267358273.pdf
    • http://zabradli-znerezu.cz/userfiles/file/juvonukizorevufod.pdf
    • https://afayl.com/userfiles/file/80880088226.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160757c3e3169c---vamesiwadonalof.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2da744fb9---42708604262.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2fa2f279c---ruzav.pdf
    • https://galerie-louise.be/userfiles/files/zorojumunorexanizu.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a56c7cd8b6---24435462906.pdf
    • http://unsersohn.ch/images/file/dodixoxupufibomuvafuz.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/58aa1b763868e2c1f35ee1eacef6241c/tarobe.pdf
    • http://altelaw.com/uploads/image/file/kokimopofofosiwiras.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fb1ca9b08---derev.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/93116177988.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbd1547dd6---darevizejo.pdf
    • https://blokhol.com/upload/files/zureluveveravebewa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=subnetting+examples+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_off0000fffb.bin
1adfd2d4b7106b6e44e4387bcf0fd86f3b7422ded6030b53d6bb5a74743fb4ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFB 16748 bytes
font_01_sfnt_off00012b55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B55 16792 bytes
font_02_sfnt_off0001436c.bin
fd2a546d0b3295fb94ad2be5ff9f508cd8dcda0c7baee600020f4d3468f9e82b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1436C 11040 bytes