Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf0c254badc5f42…

MALICIOUS

PDF

89.9 KB Created: 2021-08-12 11:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8b9e04cee77d38a2d0796af3ade36b95 SHA-1: 42dd0413b0d511a175495f0d13aaedec350143b9 SHA-256: acf0c254badc5f42351cc9fab1e8f526d9be63c31b6144cc302453a6fd6410cb
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting it's part of a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096effa3e614---moluselowugudalomonepe.pdf In PDF document text
    • http://billsky.ee/files/file/rijowis.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f4dd6de1d00---11478334242.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/vurawefupunexazuj.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/fafadonutuzela.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/c942c2081510a70cd8e48da56c2e1342/74477951989.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085a0aa50c28---bokowezowazidakaji.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/kutizajazotasa.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f805bfbb745---58048853616.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/wajawufalofobi.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/xewawavaseruzape.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/be6f48a4dbfbd292b32e22b3d8521dd8/37324806186.pdfIn PDF document text
    • http://ledesmasportsmedicinesavannahcentury.com/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/1411711671.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/7o96nkrrcjqplhvn4ubdo447gi/xazalinojam.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/nesejilasizazizetefokobit.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942014b1c0a---1031206152.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/21068033107.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/xusonoji.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/nutoxasudopoveleped.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3efefd8c---25986653643.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/makuduxofariruvosa.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/misulaguganixerebusuji.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b882713f94---48970113241.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fde841360---53424393489.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/13083947891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=discord+nitro+emoji+copy+and+pastePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 10872 bytes
SHA-256: 83bfe1b9bec03482cf95bd6703e29bc781b800d822650c21d31b459924c2a513
font_01_sfnt_off00010d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 20580 bytes
SHA-256: e93c4057a8247ba85c5d126e42c47dd10e276814be288a2189b95ba6d6b7d7ac
font_02_sfnt_off000141d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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