Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9725c5035423967…

MALICIOUS

PDF

69.5 KB Created: 2021-09-27 16:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b82f762989aa2fc15eb38d35e74f081 SHA-1: 0a2b33b474bd40603c4851337a1bae6c364bbbc6 SHA-256: c9725c50354239674864b2b5f5e736ea0cbc42bf57c0bee5af0247afa58770e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://speakingaboutnetworking.com/ckfinder/userfiles/files/65165610431.pdf
    • http://royalleasingny.com/admin/images/file/21306861286.pdf
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/fipujarizoxavuguxudanemal.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/c9eecb8f2261a10f43b5f71ee2305480/78147771207.pdf
    • http://risme.vn/files/webaperodufinexirekokef.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133e46f987c7---1496624055.pdf
    • http://surinmajestic.com/phya/ckfinder/userfiles/files/73535724451.pdf
    • http://swhos.com/upload/files/mabitadiloranapofidajob.pdf
    • http://athaj2.specialty-match.com/upload/files/gasirefu.pdf
    • https://adeptos.clevercloud.pt/images/items/files/xitixelugisadewus.pdf
    • https://behbehaniprojects.com/uploads/files/senil.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150fa0cda3dd---83721916773.pdf
    • http://ammk.sk/userfiles/file/kozipufilakawavobip.pdf
    • http://kk-gorenjska.si/uporabnik/file/5193536422.pdf
    • http://starroadchina.com/userfiles/file/duzizemudenewukizozojagaz.pdf
    • http://www.binghan.my/userfiles/file/valipivovutiretotivare.pdf
    • http://gemwishrs.com/ckfinder/stones/files/taberon.pdf
    • https://bloomlight.pl/_bloom/file/sewafuzotilawoxip.pdf
    • https://hyper.vessty.com/_img/files/xijoxutet.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba5b1e164a---56822540760.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f5f4c59b0---33588645354.pdf
    • http://dienhoabacninh.vn/webroot/img/files/70886401767.pdf
    • http://alibabashipping.com/userfiles/file/12118814383.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=yu+gi+oh+gx+academy+cheats
    • 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_off0000b305.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB305 16792 bytes
font_01_sfnt_off0000cb1c.bin
8ee749e9d2647ac4f4019b9e8e9026c43131515716f8b33fdf1038aecaa10618
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 10864 bytes
font_02_sfnt_off0000e41a.bin
32af9aded35f4371e3195c18be22e2481f590c82bd5e8f3eb4b6c19cf5a0579c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE41A 14412 bytes