Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa236c11ee6e884…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 08:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c40957827c832e8b7ac3e04cf9a9047 SHA-1: f495929b66812000ccca299a321e7f6fdf083dab SHA-256: 6fa236c11ee6e884e6d22eae4c1fea796630ff215e9bf8ed31245b4600efaa6f
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 CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://adlinefor.com/home/webagen/public_html/korn/data/file/mametokepezifomazobade.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b9835b92---91514464730.pdf
    • https://coluer.ir/documents/file/jixazeworijutezejebo.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f668fc0443---75916913336.pdf
    • https://digicpictures.com/downloads/tamivemokidukufu.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/81da7351ca31ed3ccaee4bdc604678b9/lexefatekukosepolu.pdf
    • http://opuspointpartners.com/ckfinder/userfiles/files/95409246460.pdf
    • http://halmar.info/userfiles/file/88299589018.pdf
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/77777675655.pdf
    • http://sarkanyhajo.hu/files/file/nefevodi.pdf
    • https://komunalno.vrgorac.hr/files/29681969639.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/79rqbl69q15i6qnqk9rjinc7i8/89392230538.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/f987a9fda89fdbb8c4271ff42707f3e2/9468243774.pdf
    • http://bannermaul.com/userData/board/file/59631922762.pdf
    • https://mimpiindah2.com/contents/files/kekamojekomefavujuzokuj.pdf
    • http://inter-travel.hu/_user/file/tojadaxalimasisixa.pdf
    • http://dxline.eu/userfiles/file/saradoninudovasuz.pdf
    • http://cesnek-vysocina.cz/UserFiles/File/78420497515.pdf
    • http://badaranquehablar.com/userfiles/files/velog.pdf
    • http://investgeorgia.ge/userfiles/file/57058245585.pdf
    • http://leebyunghun.kr/new/upload/board/files/90384746095.pdf
    • http://siamsnail.com/media/userfiles/files/xabiwupexisikibapajefaza.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412e646744e---61275277210.pdf
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/35280726977.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=best+tamil+keyboard+for+android
    • https://mediaget.com/userfiles/files/xigitenuvijigigi.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_off0000d88b.bin
83e623f2dadc10ff8d33e71d092976536f4775d1c3c9399835b1ce2b7426f665
pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 20296 bytes
font_01_sfnt_off00010e2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2C 16792 bytes
font_02_sfnt_off00012643.bin
59605be6b36cd0b639c48078a80769f09c046383f29fe0bd5f6bbec3d6d64ac6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12643 10916 bytes