Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fabecc09a5b0c4e…

MALICIOUS

PDF

82.5 KB Created: 2021-09-22 11:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b959e1ee18ee8722b448cc3cfa3add59 SHA-1: 300e7bcff7959d8e8523740e4b70398847b066a2 SHA-256: 9fabecc09a5b0c4ea716a9ec356791089c218d3f632c851be27d362753d93543
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external resources, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm for distributing malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides a password to decrypt a subsequent payload, a common tactic for evading gateway scanning. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.adoz.cz/ckfinder/userfiles/files/43090486497.pdf
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/sasagamimudaboxatozukok.pdf
    • http://pileshoppen.dk/userfiles/file/41886779328.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147d5f57f25a---mivamavi.pdf
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/99031043762.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9fbfedae2---jatoperumonofaru.pdf
    • https://xn--b8qxb801j.tw/upload/files/doviworaxotig.pdf
    • http://www.serenissimaservizi.com/files/19681418244.pdf
    • http://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/resomebukawepexe.pdf
    • http://lycee-elm.info/userfiles/file/63449934013.pdf
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/44153216775.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16147529e2c674---8654332439.pdf
    • http://inwallendorf.de/userfiles/file/buxemisew.pdf
    • http://borneneskontor-landsforening.dk/userfiles/file/xutexejodovodakuxituz.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/ff3884714215ac160f0efba4e7e0a7d5/79161291326.pdf
    • http://iswii.net/ckfinder/userfiles/files/87726362743.pdf
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/35957007568.pdf
    • http://stilna-ya.com/_userfiles/file/53009091038.pdf
    • http://satisfytech.com/ck/upload/files/majujovasakuvug.pdf
    • http://www.northern-japan.com/image/upload/File/getomobekumuf.pdf
    • http://bubb.cn/up_file/file/buzejedepofudi.pdf
    • http://german-ex.com/images/blog/file/xufitiwomesewezeg.pdf
    • http://aardbeienfeesten.nl/uploadimages/files/vagerite.pdf
    • http://moristas.com/userfiles/files/29850851066.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=god+of+war+ghost+of+sparta+iso+file+download
    • 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_off0000db25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB25 16792 bytes
font_01_sfnt_off0000f337.bin
1ddb1a4ec5a01e319006771e62e589e92dfa1e5a58cc773b88014d1eb80482e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 18308 bytes
font_02_sfnt_off0001231d.bin
eaa09069622aa0794914258883c1a471b691f4f0575ad7fd57e202edfb46a777
pdf-font-stream PDF embedded font (sfnt) at offset 0x1231D 10904 bytes