Malicious PDF — malware analysis report

Static analysis result for SHA-256 29a88ff871655f5e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 08:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7088030dfdebdfa9ae0373eeca07910f SHA-1: bfe8ea825d0063e413bc7623183a11284cd12e2d SHA-256: 29a88ff871655f5ee41b7e89f4821a4b0e83d2dbac26ef24acf95529fe063edf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rosg.net/sa_upload/userfiles/file/20210907073724.pdf
    • http://elitaliaweb.it/upload/file/kibumetiwalagexe.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/f8604c3cad1734d2e36da387a2047def/70903021000.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4672a8fa6aafb0b53d50143c1d424bc6/josuwonulogorat.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/t8947n1dcj292snrn1315qmqr7/doxurenuka.pdf
    • http://emilygrilltogo.com/uploads/files/95286626066.pdf
    • http://hasici-pristroje-eshop.cz/files/file/vodumododex.pdf
    • https://tonycustomtailoring.com/nbloom/fckuploads/file/54503423301.pdf
    • https://ibeguiristain.com/userfiles/files/30557655596.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/d5b9k3cn6piu4ijkjbp77rserd/zutapavajokuxenekobesikij.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/0c2cc62a66370348c4587f424b1b63c8/milepupurobod.pdf
    • http://chikatere.com/Upload/files/raratojadesagevivuzu.pdf
    • https://mahae.hu/files/files/xinixo.pdf
    • https://dineflon.com//files/gofevefepaguvikaluwejid.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/35847469192.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/5cfae26d306d6f663d7fab2944fff7aa/81926813975.pdf
    • http://washchienluoc.com/upload/file/xezatetiwajimax.pdf
    • http://boschvietnam.vn/files/usersfiles/files/31997179935.pdf
    • https://vietspices.asia/uploads/files/9406771159.pdf
    • http://flirtproducties.nl/ckfinder/userfiles/files/wirevilikusawu.pdf
    • https://pharma-tools.eu/galeria/file/vekuduwif.pdf
    • http://sacoorhealth.pt/site/upload/file/zasajan.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6a6288572---79266568552.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=catholic+study+bible+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_off0000dd1c.bin
4906d9ae11760b05eeac6573db87b96d3fa846162c685011fcc2d18285e0ba83
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1C 10900 bytes
font_01_sfnt_off0000f64f.bin
a3eaed2655d10dde5a40c2c957d9b363fb351989ab8b7da78ae105e1d67fb631
pdf-font-stream PDF embedded font (sfnt) at offset 0xF64F 16876 bytes
font_02_sfnt_off00012203.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12203 16792 bytes