Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7dc137853e2294…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 02:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c11cfa36789653b6759f71b32e96a264 SHA-1: 765d6cdae5f29f086561255df20828dc1b236b7a SHA-256: da7dc137853e22947f42a2fdf64c8d6eedff078185d2bc03c1423c9aa07af691
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics points towards a spearphishing attachment as the initial attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=how+to+stop+random+sites+from+popping+up PDF link annotation
    • https://fcimoveis.com/imgs/file/4537083694.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/86286310664.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16130aaf5ccbd1---lexebaxawuwawazodin.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/waxufaxeno.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/72672149076.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/zojudokivamufunapotin.pdfIn PDF document text
    • http://xfswchem.com/upload/files/gatofubifevejebokuwipukut.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/putufezuteriribogo.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/95177976541.pdfIn PDF document text
    • https://equinox-e.com/upload/files/laxomufokekelelud.pdfIn PDF document text
    • https://kuepancong.com/contents/files/kuran.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/magavoperepogozaje.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16134ea7858520---4741322869.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/0lktsvr2nubqkb7prq0cqbg9aq/46438804321.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/tumefekodilobifi.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/mebodotofukinuxikik.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/lizidusugoweponerik.pdfIn PDF document text
    • http://hidramaco.com/files/files/dabafivokukoruwodimofaxep.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/jilaxun.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/rexaxugunedaxanuxazog.pdfIn PDF document text
    • http://elitk.ru/_files/renodelotenasojepa.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/madir.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131bd531d323---94664952142.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3a517c3c0477f7bec16e535ce0645213/mojewogagoruf.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/rajozupeza.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_off0000d9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F2 17652 bytes
SHA-256: 02673522845c36d3ab203bbb59af4e1d85d0ad7f29772c8be278d7c046e939e9
font_01_sfnt_off00010743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10743 10972 bytes
SHA-256: b52b65074bf3cf655c7d4d2fec8e98bd19787b9ae2938e66dc8b7d0659424502
font_02_sfnt_off0001208f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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