Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e745b2c61b05e5f…

MALICIOUS

PDF

88.3 KB Created: 2021-06-29 08:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c61006f166f129ea0fbba95ccb8b1812 SHA-1: 5744210b00931fcd414ca771ca17ec938bef5e9d SHA-256: 3e745b2c61b05e5f977791d03f0e8d633cd8e0e28b39921d172bddc68522978c
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or SEO manipulation scheme. The embedded URLs, while numerous, do not appear to directly execute code but rather redirect to other potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160727147af8c8---60840317935.pdf
    • http://steelbo.com/uploads/admins/u0/files/20210531135232.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b09f58cad6d---9824692812.pdf
    • https://ferdavagnar.is/images/fck/file/zolusa.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/pan79va5fkgi7lies0eneg7ieo/9239338431.pdf
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/36539567645.pdf
    • https://prokoncept.hu/admin/blogfck/image/file/guxaselekaxijekojagifere.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce86965123---47898003907.pdf
    • http://fixafilm.se/userfiles/file/ligakosobinugodujanu.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/lh0m19i6v2ujh57ld0m6r98sdo/98181117917.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096021d55e7d---69762034111.pdf
    • https://sharadsangam.org/UserFilesTwo/file/61311194185.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/6ad51d00d9c0103d97cd594284c03f32/90562110102.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607497e706252---51957560749.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/bc60c3a70d1a6d722c6ead1c298b395c/27360602409.pdf
    • https://fotoprint.lv/downloads/file/39183497617.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25f224a6fc---momivizegepofepufaxaduk.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcbf603a9a---rutuvoxufumu.pdf
    • https://estoniapools.com/contents//files/41163325462.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dc09b7323---32971130082.pdf
    • http://global-leasing-management.com/uf/file/69544346710.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/bkim11us23h5ua2772rv4d9j45/feripubuvijemowodig.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ddb945758---tuluniduxezazadamamu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=free+bus+pass+for+senior+citizens
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5dc.bin
8bf165a3303dd6d6dff64b0364260f13403be92bd65b2db0b5785da1f22b6391
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DC 10704 bytes
font_01_sfnt_off00010e5e.bin
e0a405003bc496c66eb7afe568cb88bbb665923ef000743cb070e4400d8bc5fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5E 16932 bytes
font_02_sfnt_off00013a4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4B 16792 bytes