Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc2ac72a897d8b0…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 14:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb0d2d36bc340784db745d31eb1e831c SHA-1: c6685136b5d754824bade4dce06c22e2971b0d4f SHA-256: abc2ac72a897d8b0e436b263f763382ef2e7be50b1dae7e284d4d0c2f985a4d5
156 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 sites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=naruto+senki+crazy PDF link annotation
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210912005231.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/ratefowanamufenulutodej.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/89397719306.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/42909098799.pdfIn PDF document text
    • http://ustunongel.com/image/files/98181315727.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613df8d14fe9c---9575034017.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/bidirojotiwoxega.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135294568bcb---puzitajilapizonusomubuza.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/gisamesobijulotexamuwuta.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/68ce54e3e718de5b99d83d9177693fad/74776703330.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/puluxoxaxidog.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/bilexefakakixolutosa.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/tawapuxejovi.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/61417312612.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210917_090046.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/78990674345.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/fivagevujixenusowewezif.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/jalaxugitinisir.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/35529020255.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/kakaki.pdfIn PDF document text
    • http://yuhuimachinery.com/d/files/busib.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/xasexoxuzunuluz.pdfIn PDF document text
    • https://alutat.com/data/file/91349340732.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/71190010829.pdfIn PDF document text
    • https://timminsrenovations.ca/file/rGY8Ufj9FQJh42Je.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67C 20328 bytes
SHA-256: 08c5ffbd77c7863825f5c9820e79bdeaee53c839d653839f8a7155e6eca85273
font_01_sfnt_off00010c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12429 10520 bytes
SHA-256: a3ff6971e4eaac31070480ccb85446aed898af439c430bb1150701f7bd7b9a9a