Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc9ac0ed4862e49…

MALICIOUS

PDF

69.8 KB Created: 2021-09-05 08:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 87b95de55eb4ff3031ebfe3d2121d057 SHA-1: fde3bd6aa394f23915b6168aa6d95dad2dfaebfb SHA-256: 0dc9ac0ed4862e49b9ce79fd716cd73992f59ba4b34362e8177f1dc244b0c2dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest an attempt to redirect users to 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://irlanc.ru/uplcv?utm_term=electrotecnia+paraninfo+pdf PDF link annotation
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f034576dff---vepirudukozufuwesosev.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/xoloxuropupaxazojokexi.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/28920836952.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/kalunabeti.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/60711617950.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/bebogivutagivulujonalugit.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/ledeku.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607007f9dfece---vovagozus.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109031725404563.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/39179765239.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/78471158434.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abb05c310c3---gutusegubudelogikonadib.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a10e458abf4---74192579563.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/95375735728.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/t2rhut76a6m8ko0bb7v26f0rd2/jajodabajojonuk.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a502f397ed4---47605020269.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0c340d990---xorojevikuk.pdfIn PDF document text
    • http://school15-tyumen.ru/f/menevofega.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/kawit.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/nebofawuwiguwi.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f119389bf---14729607870.pdfIn PDF document text
    • http://temple.mo/userfiles/file/20110836623.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/38805683236.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_off0000b3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CF 10428 bytes
SHA-256: 6e24aeb224d8173bf03bb5154adede62ee5954e278da3aba12a6d44b4ab88a5a
font_01_sfnt_off0000cb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38E 15244 bytes
SHA-256: 74c140db9f46ac71f963c9813b44ee47df8335b9294df1601eaf65f945e9a0ac

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