Malicious PDF — malware analysis report

Static analysis result for SHA-256 de03b8d5a2356ec7…

MALICIOUS

PDF

87.1 KB Created: 2021-09-08 20:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c2d1ebf0db806bf9aa9b1d3f804b46a1 SHA-1: 8ddeaa0a376a96a255bd2658c25812a955649fa6 SHA-256: de03b8d5a2356ec7925d5eb1ff5b7b871e576d90733de24ff163f4acffca86d3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including links to algorithmically generated URLs and compromised WordPress upload storage. The presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, but the overall structure and external links point to a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 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.
  • 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://krisoc.ru/uplcv?utm_term=tendinitis+pata+de+ganso+causas+pdf PDF link annotation
    • https://mamap.in/ci/userfiles/files/dudamotaxos.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613214f52635e---jasusufazeketaxejofe.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613271948083f---22324939710.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/11511731178.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/buwuxuwifukonazugikamug.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/ruxotawibepeluteloto.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/13122531720.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/40523029265.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/wolegorugepebifodes.pdfIn PDF document text
    • https://eguiders.com/uploads/93959274468.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161380fa72c880---47891031170.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/37383438578.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/poponomofowipifijota.pdfIn PDF document text
    • http://360global.ca/userfiles/file/70719358757.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/66814552625.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/56974050951.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/xisizidogupalukobida.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/gosabasonumumo.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/95021076069.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/48749666841.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/77876439731.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630704721.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613793b41b308---74577243133.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137479c258d8---zikenesaduxazek.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/xowojuge.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_off0000e9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 10712 bytes
SHA-256: fadeff9410879c7ca9ec28af53e4259731edb41d14b159638a76bd57a5ecb34b
font_01_sfnt_off0001024f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A61 20432 bytes
SHA-256: a7753854be757135d5d44a5f49e7382bca9fc88700e98f2e601a371669b4ebe2

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