Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3ba9a7eb886886…

MALICIOUS

PDF

121.9 KB Created: 2021-06-26 00:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2163aa30b090f7f7deeeaaa8a24bfed9 SHA-1: 2d0980cc3c92ad9aa29d32558c6a9058b39ee260 SHA-256: 8d3ba9a7eb8868869fdebfca3c9d5287ec3cff50cafadcc83d5a05847b6a1f9e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating an attempt to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c92007ebc28---1916049881.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a105adfc06---56655545581.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/r030j8r7k3okekb7q08pntblh7/6534780916.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b16440827e6---21368383403.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/cea3e29dfe86dfb78e52d84ed3d3f2e9/diradosoba.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/9826fca8f3294c90556e8d2d1ab8f731/13665063979.pdf
    • http://schmetterlingsgaerten.de/file/21557861650.pdf
    • http://montaze.org/democms/userfiles/file/29628964141.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/25k14o332cjo2lphnrv8lutpbs/17410035580.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f814ab5e4c---27796985130.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160749553a988a---1588838213.pdf
    • http://www.tecnobor.com/ckfinder/userfiles/files/rezokivorevelugepisi.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/91a2c3c4b3c89c921a5b3b6a044796d6/41083728740.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/efe596d034c8fe8aafbec3ba084293fa/fogikegunijarusutifelivu.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8682e29954---tenogepulireli.pdf
    • http://autohondl.cz/userfiles/file/84448689986.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b9f1ba05c---motev.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/2e955384991aabdbf1e7237a51629993/46293539133.pdf
    • http://fsoa.cn/userfiles/file/muvanibixetofolegugawex.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/81e958dc8261856be02c5d2ff8fb925d/35320914946.pdf
    • http://bezagsecurity.cz/userfiles/10601624978.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2104c634a9---xiturozul.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2fc70a8b5---tajuvewimab.pdf
    • http://donghocasiochinhhang.net/uploads/userfiles/file/78193063900.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7f6fde3dcc60824f049906ad0e62da95/27328409257.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a62b5863c---22371598987.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ad6d4bfb---xotokamekosowomabuxedatol.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=summary+of+stave+1+a+christmas+carol
    • 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_off00017b78.bin
2a97836bf13ee0f1ef28473a799bd6b15818d501440b2f6208523940dc928f3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x17B78 10904 bytes
font_01_sfnt_off000194d1.bin
19731e43f50e4de5c1c8f04854443a0e8ee9b8987dd50c40277730f8cee05871
pdf-font-stream PDF embedded font (sfnt) at offset 0x194D1 17340 bytes
font_02_sfnt_off0001c1f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1F6 16792 bytes