Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a729f304cd741fb…

MALICIOUS

PDF

106.0 KB Created: 2021-09-07 07:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9e7d10212246733af7c32465dca3b9b9 SHA-1: 88a80eabc4002f9b509495b511d7346931a74d79 SHA-256: 0a729f304cd741fb402785ae28310fe731fe4b918d56e528d35ab15f6eba57f1
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristic analysis indicates it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://villapellegrino.it/userfiles/files/bikenupilijulureris.pdf In PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/34cd1fd1e02aa2fc5eb751f52ff5583f/bedepazos.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/lizuvuvisetod.pdfIn PDF document text
    • https://room12shio4.com/contents//files/30733077340.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/84281776067.pdfIn PDF document text
    • http://dakov.hu/_user/file/65028635929.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f73e282b4ce---68028978344.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/4587600749.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/21364230968.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/79914935646.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076190daf38a---37685260647.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/52844059804.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b62244f4672747bef74c70314c652986/45029431417.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/60483010405.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/63307355555.pdfIn PDF document text
    • https://maviet.vn/upload/files/pifokilovexajixusakadaw.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ff950bec6---23217119229.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/81519d0633768195454279527268795c/jasunubenagew.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad98c71c5e---zekexemilolopaxo.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/kipunita.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/eqmmg1ua7qv9e5jqp2j2p7s3bi/86360178483.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/57082288651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=matrizes+em+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/71494763199.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_off000135e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E3 10444 bytes
SHA-256: 40ca69b44f9f6fc5ffc5a938c7934e8e7f85b67f4cfb6c4394e12154d78946a3
font_01_sfnt_off00014d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D9E 20204 bytes
SHA-256: 4b8ffda57762b64893eb4b3fb1eca38f4816d200448ed67ae12fb223f2788fec
font_02_sfnt_off0001830d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1830D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1