Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5dee176cd5969e…

MALICIOUS

PDF

92.3 KB Created: 2021-07-25 00:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ea32285c93b050ff6ba9af0655edf1d8 SHA-1: bd9b75cd57838641ce13de54588f3371512d6517 SHA-256: 6f5dee176cd5969e50a239010ad978f71584e23c9b2e981b63507ff1841a03d7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving external resource redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/vebofut.pdf In PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b329ddd94bb---vejukesinibelatedogomegob.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/fukofinubo.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/80218207850.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/fobitobogivojikasulesex.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c25884237e---duwilemekumedodiruwigivir.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/gelasenopegofek.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/beferef.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/nlj1pgb27blupsf554n1akjt3l/gasoguni.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da86588e3d---tabivoxubadewezu.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/10860138365.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abef0910f51---62159647279.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/48839680235.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/lurasozoxapavemuwa.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/81481778905.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/zanavininupisawifisa.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/gumevevoximegozobazimu.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/8enb84jqjghn098ph1s9qe0an8/33545778823.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/gajopatedunofuxoje.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/8581ed9b1d4cd3a0d61aea1da6739802/8318878736.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d239f8801c---35412514085.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/4f5cb1c05e0a1500304679050e62bb97/47750280668.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/legivuxobojojisibuj.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/gufifodexadejonakole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=nsb+app%2F+id%3Dgovinda%2Bnamalu%2Bin%2Btelugu%2Bmp3%2Bfree%2BdownloadPDF 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_off00010303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10303 16968 bytes
SHA-256: 7caca5fa2a03c318900e625f3ddef1aaf31ec705714e7eb04974bb1176c26829
font_01_sfnt_off00012f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1F 11464 bytes
SHA-256: 4a1944d05fc46359bacd381a5eadebcd0b9a4d7c589cbb6c9fe3965e6b86699e
font_02_sfnt_off000149fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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