Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e83c9b611e09f8…

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 15:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f40dab23befc3e565634442b62e7c6f1 SHA-1: 4b66275677ce7d73c073f9876f0c4b69b31f0e85 SHA-256: d4e83c9b611e09f8d589415f277980ad65b479a610e8b8f01edb61f528743aae
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The document contains a visual download button lure and explicitly provides password instructions for an archive, suggesting it's intended to trick users into downloading and decrypting a malicious payload. Multiple URLs point to potentially compromised or disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mylivediamondinventory.com/uploads/files/finuxupidugo.pdf In PDF document text
    • https://ruedi-leuthold.com/userfiles/files/69884521821.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/poloxid.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/38270310438.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/80807022755.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/gigelavutagi.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ft1t87aeoin6e0t2aln2hsldjl/21457376822.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/46124997455.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/guxivuzefuserinaw.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/notuvipanikiseve.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/suritezefede.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/85953000026.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/renoba.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/24c9313ec8f79dffe773b505b0c0fa7f/tiweponefeku.pdfIn PDF document text
    • http://mweb.cz/images/file/sazovotinefuwum.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/75245360759.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/nuriripibabumuje.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/gareteje.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210908045714.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/junelogolurone.pdfIn PDF document text
    • http://tajilin.com/upload/files/31010084407.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b16e4e1f28---pinenagigexawobonofame.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/rivexorewaxusewidagesituj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=gta+android+download+highly+compressedPDF 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_off0000dd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD45 18452 bytes
SHA-256: e31f13b0542383235cff11a70ff962c0402147067f596437e0248ce5c01c5a7c
font_01_sfnt_off00010d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D17 11200 bytes
SHA-256: f540bec9e42d30c58b265a32787e785302c002f2e7c9e26746010a1bdde86a11
font_02_sfnt_off00012706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12706 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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