Malicious PDF — malware analysis report

Static analysis result for SHA-256 544b06bc57a10184…

MALICIOUS

PDF

77.6 KB Created: 2021-09-18 04:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5acbcc8cb25a7187fbf51057e83e25fd SHA-1: 833420148aaa805b621b21823907f91f4139710a SHA-256: 544b06bc57a101848bafbba599b251f94c7b12732123b6506939d298e305acfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage, suggesting a link farm designed to redirect users. The PDF's structure and the presence of external links strongly suggest it's used as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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 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://huntic.ru/uplcv?utm_term=fallout+shelter+android+gameplay PDF link annotation
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa64ddbcef---luwepegigategazux.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/pizanetupakak.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/371217939.pdfIn PDF document text
    • http://www.depomatrial.com/file/65861091625.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/vigogubaw.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/42392177495.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc74d752a---lezutoxugesu.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/babatufefojodopekoxawagim.pdfIn PDF document text
    • http://aquatherm-graz.at/files/foxipekudumibitowu.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/korogesefojepenomuto.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/2966779213.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/922631694613034511cebc.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/bepiroronawijapemipe.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/51346822745.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/26967334909.pdfIn PDF document text
    • https://ptogel2.com/contents/files/11636873318.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81897989206.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/4571964323.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/38555593093.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/rusugesomowelutopuxob.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/f0474ca716b2d57ae3196133061743d2/61837394551.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f34fbcbe43---23914705396.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/tiwotumugitufan.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/22142328891.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_off0000ca5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE271 17632 bytes
SHA-256: 040e44d53800940841566a289961b095c6a5402b9ac0dcc9bcdfd434a7bb5665
font_02_sfnt_off00010fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCE 11028 bytes
SHA-256: 80539409be5549fffbd4031208bb5295eb6294bec2434f6168f8fa4f18c0e7a6

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