Malicious PDF — malware analysis report

Static analysis result for SHA-256 84bc5289d9f6596b…

MALICIOUS

PDF

72.6 KB Created: 2021-09-22 09:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b0c21023fce6b26d1d52eaf1c4d0d14 SHA-1: 3393c8324c5c80eedf5b25844fc8caeeb3aa5788 SHA-256: 84bc5289d9f6596b9caf25762d20b22bdf786afe3c90e530a1e3bfe06dce8c7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. While no scripts were explicitly extracted, the presence of multiple external links and the ClamAV detection as 'Pdf.Phishing.Trojan' suggest a malicious intent, likely to redirect users to phishing pages or potentially host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137523b2b90a---36944189049.pdf In PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161472d8d1c790---wepovima.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/fagogire.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/taniwavilovupemirusad.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62346723133.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/15325564693.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16138a62231d54---98040438783.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/66122925392.pdfIn PDF document text
    • http://888chji.com/userfiles/files/motoxatavedodevij.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/70801973963.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/89665542928.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/tegemusofigatiloputamuza.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/pipibapujinosakowegoze.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/25521696022.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132f2f1b287c---2495591015.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/63675779082.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/32725493779.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/8471d11726d999b171e2bd55c9a56460/54631361867.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/4428000902.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/nonadovamonemukadowibu.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/61525581950.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/denosulogaxi.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/57155638099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pokemon+soul+silver+cheats+without+action+replayPDF 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_off0000b76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76E 16736 bytes
SHA-256: 5743ee3636446f6afa6fb0584af1660ffef14d22772d14bde56a224387fccbb3
font_01_sfnt_off0000e2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A7 11096 bytes
SHA-256: d416300019512da5fb87c4cc3c6700bc852b1ed81fff745d7f852b3a08076e13
font_02_sfnt_off0000fc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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