Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2c610282e4ba42…

MALICIOUS

PDF

92.3 KB Created: 2021-08-13 22:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d5123e3c610a7b35ce29a03abfa5551 SHA-1: 958b79a02c56ec37980f229ebc58c54ece0027fc SHA-256: 4f2c610282e4ba4254551187a5b95aa080162d04d28cdd550603170b912078c2
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload or phish for credentials. The presence of embedded JS points to T1059.007, and the overall malicious nature suggests exploitation for client execution (T1203).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=new+english+file+elementary+test+booklet+key+pdf+free+download
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a5f97218f---lufobubeka.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/3ef79ec2499df06ebecc6c518d8026df/julabelijamotilap.pdf
    • http://barcelonasixtytwo.com/userfiles/file/xudimowolovovawaz.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ec000l6r2if397ijr47kre4lo5/22665430708.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/e1878c392750bb14786bebf9fbbca19e/18524663122.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/981957749ecfe6aebe67a8450a4b74df/womigefes.pdf
    • http://gencshow.com/upload/ckfinder/files/totufitazupixed.pdf
    • http://snotlicker.com/clients/10243/File/muletabozosigimed.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861bd97f74c---visukuxar.pdf
    • http://yomamasushitogo.com/uploads/files/zevesum.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160f7d16239a7e---66152901041.pdf
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/pewenokusumonogap.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/7135c05197cf0e9ac81c3b3bcc7641e4/26367571467.pdf
    • http://handbook.hu/upload/page/file/72546348534.pdf
    • http://labonguyenhoang.com/img-chamthi/files/46220852003.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/cb505e33cdef775b26b52b2b27b212f2/61358149421.pdf
    • http://klpa.net/userData/board/file/pofig.pdf
    • https://netcsemege.hu/ckfinder/userfiles/files/delawipebenapuja.pdf
    • http://commsoft.nu/demo/ktb/wsmbilder/files/zemixuxixamudanid.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6ebf8eb6e---berapigiwor.pdf
    • https://hostmegasoft.com/calisma2/files/uploads/rijepuruxenoroluxofo.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_off0000f343.bin
de4242e466dea76f1792625ee93e383d1b32e1abe0dd189c7761eded5029054e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 11356 bytes
font_01_sfnt_off00010d6e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 16792 bytes
font_02_sfnt_off00012580.bin
4f0f85f7554937b23382d494e36c3dd836e5d08f5d971d3f9105df23e2993f97
pdf-font-stream PDF embedded font (sfnt) at offset 0x12580 23116 bytes