Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72b7fa5a50e799b…

MALICIOUS

PDF

86.7 KB Created: 2021-06-28 15:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4606f4afe274e73b07cf732e48674034 SHA-1: 8d3f2e08244f7a5223be0d31bf721de467c33a30 SHA-256: d72b7fa5a50e799b522cb5a618f3d866dcc60d79a17536f6ca16aa8e74cd2931
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b344111a73f---28877041749.pdf In PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/kmkd7q6daac9vj63of4s5cegoj/54060399180.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/eeae6145197e42e4c16e4d243e0ed089/wigadukotituvogefiminawe.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081733194f24---72453242453.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/59328938441.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793c875e22d---96767959237.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/fafavazuneran.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/16gj47vdspcov62keoi07dkse6/76944267082.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/e8piej7pnq4qj114v8rf2kk7ke/suwepimorozipajom.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/7bf919e09ffc5d0718d16f6930065833/sesinewewefix.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/9746883ae97d2a7cdfbedb5e127cb5b0/41831157321.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/tejomupil.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/d871c812cdda1b30d689ac0b7c125d71/15661024558.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/48271087178.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4442d1425b---12357451941.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/88044497536.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9r1rk8ep7t3p8ofe3lcbeeglq6/xaneg.pdfIn PDF document text
    • https://webmenuplus.com/images/file/52879799917.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/xidapijonisorebebe.pdfIn PDF document text
    • http://satbietthu.com/luutru/files/39809672352.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/o9r7n9vuv1vo3426mnul44j580/tozadikesimi.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/rugufopolosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=professional+wet+cleaning+near+mePDF link annotation
    • 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_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 10764 bytes
SHA-256: c6a01b8760efc835bf4cfcc617e3773aed03b13db807412490168dd18a049349
font_01_sfnt_off00010721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10721 17216 bytes
SHA-256: e779a2cde723c603df4ac1b758fc8d6a16fbbe5175d4ede0a8fc3ddfda6a0bd1
font_02_sfnt_off000133f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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