Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6d7aca244b7ece…

MALICIOUS

PDF

73.2 KB Created: 2021-09-06 08:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ddf3067ccf0f4a11926a5fb729e8b57e SHA-1: 1cfa5b100b67f5304501579a35d5ed4a39a21dfa SHA-256: 5f6d7aca244b7ece12957f4b93f89b9f487aaffa9e6057eff0ba3e80fd7f945e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The PDF structure and URL patterns are consistent with link farms designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://oniceh.ru/uplcv?utm_term=manual+sap2000+v18+espa%C3%B1ol+pdf+gratis PDF link annotation
    • http://sbstroy53.ru/img/files/21244922384.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eca13cbb15---41631868536.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/45719493631.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/02264cfa5c96e40e877b1f761a5d7e91/zuvelafiguxiwedovu.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160733332c2b51---nesuvujaxalesiwoge.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/93453744590.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/jovojakikibuzanel.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/23128431640.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/3b5bafd34e531dbe3c5b5dc23dee52ba/getalonugaralorixog.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/56a83ff0c5219da360bbe6737c6d6412/tolabitedikowir.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/godokowubujuxamefadori.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/sabavamasuvidotepanol.pdfIn PDF document text
    • https://limsurempat.com/contents//files/61560823555.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/6enrmjmfplpeq06uf1klr46hoa/98728969032.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/72004623355.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5555dbc2e1---sapimo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dee0afdd862---59796267908.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/1d73v437pia3t3uf49qm06j2h5/tetogixeluginapanez.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/52361274959.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db07e2bb016---86056560903.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8227494d1---bisonajufofaxaruw.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/29500760591.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/58516305097.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_off0000b910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB910 11540 bytes
SHA-256: bddf849cd42ae425711de529bf67f572d03a8ef5d0dafa04c7ff66e1ac420b47
font_01_sfnt_off0000d42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC41 16484 bytes
SHA-256: 7b965ec526b6777012aa43800ea894cc18c3ee09449b3e3981f8969f1afbde1b

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