Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0961ca335fba9c…

MALICIOUS

PDF

75.3 KB Created: 2021-09-09 16:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0618046d008a09087448ca10b00327c1 SHA-1: b18a3ebfea3c68eb2df215a03fa2984338a65fda SHA-256: 6a0961ca335fba9cd9ec6e94c4752fb2f7438d966a22df63fb30854d7191c4af
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised. The presence of a link to a WordPress upload directory further suggests a compromised site is being leveraged. The primary goal appears to be redirecting users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://w-mill.jp/images/file/varabivexi.pdf In PDF document text
    • https://soccerauquebec.com/userfiles/file/62942374274.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/masitoxomumikitonulok.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/27082453401.pdfIn PDF document text
    • https://upaspor.com/resimler/files/73948470009.pdfIn PDF document text
    • https://tessuno.com/upload/files/613078bde6d79.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132e5a2b72f1---xitalokofirederawugukeni.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/nuwokinurigijofilop.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/kalitowakufit.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/zinoluwojukawirosagidoba.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/rogenomabadadozoki.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/xelunejemolevo.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/mikowosefaxizenazusawoxe.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/32141cb299307318f9a6ff38c065bec1/vizasiwilazulaxeti.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/84973742869.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/89100222767.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/20257098069.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/99907248660.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/zofalilomapubo.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/45949190585.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cb2cf1a8c---34214281759.pdfIn PDF document text
    • https://businesslife.com/content/file/51700135106.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/tozetaxuligidadeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=tara+shanbhag+4th+edition+pdf+free+downloadPDF 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_off0000c249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA60 11044 bytes
SHA-256: 5d310b0bb9ef584174bc5013b4525fc8589423a74df22ce660e7ecaebe8d4c39
font_02_sfnt_off0000f3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 16896 bytes
SHA-256: f4f996a27e93495cc8a263b12f4d2bbfac5a545a73fa9bf9f0f5811415a38b17

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