Malicious PDF — malware analysis report

Static analysis result for SHA-256 923604b2a3423873…

MALICIOUS

PDF

74.5 KB Created: 2021-05-04 03:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 143b77f7a228cdbd19dfa17f12e185f7 SHA-1: c1bcf1790dcc7ece340e6ecb4fbc6902cc394e28 SHA-256: 923604b2a34238735023ae0a616b3546a3a8936218a10b21833a9ec5c11b4758
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of an advance-fee scam. It contains numerous links to compromised WordPress sites, likely serving as a lure to download further malicious content. The PDF structure and embedded links suggest it is part of a phishing campaign designed to trick users into believing they are receiving a legitimate document or prize notification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f21555ea68---liwuzim.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b3aab89125efdf46cf7fbc7517500d0c/36397166150.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160892ac5e36c5---jenajagepexinapum.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ec0b1792d---noxinorutiruwufipefo.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089db021ed6c---6602443090.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f372e817---47193492644.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b61c3a6d---bosal.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606e59114aa64---33851640685.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078982d7912c---43811876705.pdf
    • https://allcreaturesinc.com/files/files/58365800071.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/afi61svgsat0famuh7ls49d1pt/zilisovazoxolus.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/iujgvdiasi9h06salat7h6g254/pudiwodowupu.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd76918599---memidekevozopan.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5f31efa7---25931856701.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/787ffc22acfefda30ea9fa8ae9c5d78b/towenudigufig.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/914498e87c0d7aa3ac8689cd91ce3669/tobisur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=adverts+on+android+phone
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3fa.bin
0188e4ed264a5898245e3535d7310c76b32b707e0e6f92c48a0e2bb3384fe6f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FA 5064 bytes
font_01_sfnt_off0000f532.bin
1de69e72a1219fcf0335b40e31895164e5c85bfcbac09e2e390a4bb352875680
pdf-font-stream PDF embedded font (sfnt) at offset 0xF532 11440 bytes