Malicious PDF — malware analysis report

Static analysis result for SHA-256 4657db2d81434b90…

MALICIOUS

PDF

81.4 KB Created: 2021-09-27 13:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 762fc879a4bd9f1e3cc018f66c0e4eb8 SHA-1: 13b50d3a9e5b161d3d36681e4cd46631c383fdeb SHA-256: 4657db2d81434b90a0c68ec71cd194aa33d1bfcba17b354dd35613e08a84cc4f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not appear to contain executable content directly, but rather serve as lures to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://nikkenj.com/userfiles/file/gujikazugaxaroja.pdf In PDF document text
    • http://akinmedikal.com/uploads/file/gobubekezeti.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/6gbma1pt9jntlin27k5jusrl51/medujanemizuvujobapezil.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/51412476864.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469d4b79355---litupomedevovuva.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/17512702461.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/96805747051.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/jivito.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/75234228661.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/74235479007.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/48671458358.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/99179816312.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/nexekus.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/nidedewirujikuvisanasijil.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/49635132737.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/59764246781.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/40999318222.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/21956433537.pdfIn PDF document text
    • http://hangquangauto.com/files/dujabezarudidekarunego.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d08d44c32c---borelamalasep.pdfIn PDF document text
    • http://letnaterasa.customreal.sk/data/files/wiwunori.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/vinomojekowexoperukisopub.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/45090976794.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/47d75196280b6c60ab0c1124466d1cd8/53408290545.pdfIn PDF document text
    • https://kaimano.it/file/vigodusovuxuxek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=krossfire+for+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC39 22324 bytes
SHA-256: 55618e7fbc9362f694c9c5c4d65a1253f351c466cf8087906ea4ce009e113807
font_01_sfnt_off0000f236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_03_sfnt_off00012036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12036 10196 bytes
SHA-256: 7246676a175b4df616185c864099c7474803173c5f3b7072df73b54af36df766

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