Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e0629f0fc0f67e…

MALICIOUS

PDF

96.9 KB Created: 2021-07-23 01:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c768ae7a6c626215c76903e94360188b SHA-1: 10dc88529160882cb113a2f22b6e36d1d95dd9ab SHA-256: e5e0629f0fc0f67ecc8dfa26376b8e01d23ef10f302a0a50035d049a4b704b13
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress sites, suggesting an attempt to lure users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and compromised CMS upload links points to a tactic of leveraging potentially untrusted hosting for its malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • 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.
  • 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.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d1ea94448---97801719952.pdf
    • http://hgbs.de/userfiles/file/2940147090.pdf
    • http://mextro.de/upload/files/62910827746.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d700fe38b3---vejupupegitarusozisotinob.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988e85dc334---kazemuba.pdf
    • http://mobilni-kadernictvi.cz/files/file/fuvodoguwavev.pdf
    • http://alpha-th.com/userfiles/file/4809151906.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077558a5110f---70039600627.pdf
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/36634509800.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10929e3dc2---kijipapinixujujexo.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/6737ede8faa6d280a84e900212b86c91/nimijenewovalegu.pdf
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/55637639401.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c04c040863d---38805317991.pdf
    • http://seoulsquare.com/userfiles/file/78476066292.pdf
    • https://fuoriscena.eu/file/86064856626.pdf
    • http://www.siposferenc.hu/html/kumivezaligimi.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/79cns7tfbqsk1c7fsug69u57h0/11081768647.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8c7c14b4e---fazigezavatikoze.pdf
    • https://daiichitravel.com/uploads/news_file/97327579537.pdf
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/4949961457.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d24ee19433---41329242904.pdf
    • https://dotcomtravelegypt.com/userfiles/files/pabebukesuti.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/54a50dcdb31f0d356138d6f4ba985072/70901934520.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/dc13ae574dc68c797b782b32d425b50c/41219117156.pdf
    • http://olgapolyakova.com/files/files/57985059747.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987a8f97328---88285218510.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mortgagee+clause+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_off000114bb.bin
3befc214546b80faf4c8887da146db9ed46523464921575eca41985e17e41458
pdf-font-stream PDF embedded font (sfnt) at offset 0x114BB 10396 bytes
font_01_sfnt_off00012c6e.bin
d31f2086f9246055f123ab530ae9d09bf791dc8f8b2b7704c58e83dcf37c9aea
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6E 18064 bytes
font_02_sfnt_off00015bcf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15BCF 16792 bytes