Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a0889e3a90fffe…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 18:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0afe8d948933d215b8fc20548108fd6e SHA-1: 6770149484878e04b751daa634f6c5104f260145 SHA-256: a8a0889e3a90fffe72d383a475e591e80f274c58ac3cd4d3f2951c3b7d3c8bc1
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations and utilize disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The presence of external URIs and IP literals further supports this, suggesting an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/161482eb1ba04a---kagopisavesepidinunomibe.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe96a87411---zabopelulikagava.pdf
    • http://bookblog.kr/data/file/files/sevolovorelafujobe.pdf
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/41987547225.pdf
    • https://felicityokolo.com/file/karafuvutavalax.pdf
    • http://sevennews.com.br/ckfinder/userfiles/files/43952888974.pdf
    • http://leeclinic.kr/userData/board/file/jigikujemiwekawalosewen.pdf
    • http://dainichiji.com/upload_ckr/files/45295729280.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/85bb83f8a28fa7ae447e812bbd1230bd/43785747486.pdf
    • http://ehoron21.mn/uploads/files/zokow.pdf
    • http://tubesealer.com/uploaded/file/627299179614029da0803c.pdf
    • https://cordovajewelry.com/images/file/javesokaxufufevixisoxutir.pdf
    • https://pmrmhss.com/userfiles/file/69084410635.pdf
    • https://btegypt.com/file/93092297468.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/0b7227cb8d355ef8791eeab8bd781822/65567892891.pdf
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210914150037.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5c24a7e98---75079996721.pdf
    • http://www.hermosabeachbungalows.com/userfiles/files/38064016624.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16141d5c041080---51719284783.pdf
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/rudovifobufo.pdf
    • https://ipmgrouphr.com/uploads/news_file/sorerusagusagumaz.pdf
    • https://www.gico.ge/ckfinder/userfiles/files/safagubadew.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=tubidy+music+list
    • 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_off0000b0af.bin
40a42c09748b48544abb57cca4d32665489e821e0ff9117694976508239acbf3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AF 15400 bytes
font_01_sfnt_off0000d711.bin
ce4a4387d758da621ee33272817ed2d6d8586f549245031037192cb69c0bd3de
pdf-font-stream PDF embedded font (sfnt) at offset 0xD711 10228 bytes
font_02_sfnt_off0000ee13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 16792 bytes