Malicious PDF — malware analysis report

Static analysis result for SHA-256 df56c724d8b8e4bd…

MALICIOUS

PDF

73.7 KB Created: 2021-09-28 10:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e7fd842f8b702c567eee60c1d7b70736 SHA-1: 163dbb6868daef97e8d3faae48f0d4e57861a03c SHA-256: df56c724d8b8e4bd3a1f41a66583cf0781674f96c5358486923f91be0876f1e2
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://jackinthegymtpe.com/uploads/files/202109031948495145.pdf In PDF document text
    • http://billsky.ee/files/file/69459771120.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/segid.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/tezubalopaximiropufi.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/dalivotagokiwopudesoxeka.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/jupidoxojirerijebiwujaf.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/vuwimaxoluxamitu.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/55750746358.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/64616579832.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138c3fbd5de8---49178947842.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/47021354345.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/93630257932.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/63607052131.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/0fae49f40a864d7a787f56f96c8027d1/nipalajowupufijal.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/gasabajepologiruki.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/nadaxese.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/lubenotajitalutibis.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/zawunitajujip.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/xijukugawoperavefapoda.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/56872890597.pdfIn PDF document text
    • http://twatpchome.touchance.com/userfiles/file/zoweximat.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/96322856441.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161462b459f4cb---bamilegagejelivuzopewot.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a13e43f2cc---21055463514.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/kemaxijujono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=html5+css3+and+javascript+6th+edition+pdfPDF link annotation
    • 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_off0000b64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64D 18204 bytes
SHA-256: d7d621d82d575410a5eb6d09743afb51aae5692448131711160eaedc36369e47
font_01_sfnt_off0000e56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56F 11544 bytes
SHA-256: 4bf11d4fcdc76c96f64817034d4ca7829f1c536dbd4e320eb8ce0458998f9a98
font_02_sfnt_off0001009c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1