Malicious PDF — malware analysis report

Static analysis result for SHA-256 f376c6b84175d12f…

MALICIOUS

PDF

86.5 KB Created: 2021-08-20 23:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5551e97c91b1e3add037cb2b378e54ab SHA-1: c339614c31e3004b9ab6cb751f2b1ee346dee81b SHA-256: f376c6b84175d12f048cea33a8258a097cc33aaff191ce10ff543757c7054b34
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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.indoorclub-informa.com/boletines/img/file/94826059155.pdf In PDF document text
    • http://tamlaproject.com/userData/board/file/75231104633.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210814150634.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/2de9df433077b267a132eb79032d5459/bokofujeginawevasosinorek.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/65652895811.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/c5egrslb6p7orcg0e5grfi9eb7/14851452446.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/dixasojolaluz.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/kedotatimebabiv.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/8ir5b36jp0so517oe5r1ckbdh0/6558053180.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6258a12d4---fexajozobewugokalarawib.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9a3421d31---22774654019.pdfIn PDF document text
    • http://chayka-svg.ru/files/wumizidaxu.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/02652a1c4a0a77230f9859d3fc92680d/latevagowobezase.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/f66f9015a4bfaf11adb2606c754ceae2/74118925201.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/47384363929.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/tagejolizuv.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/95023429881.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/kolibemifisewalusux.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607451fd523bb---dagidafekabawanowova.pdfIn PDF document text
    • http://bdn10.cz/files/file/341436006.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/71312238094.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/kerukagi.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/4876512039.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b59e8c60a37---mirunawebapexitor.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079803ab4a53---gudopu.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/19424301269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=distinguish+between+protein+hormones+and+steroid+hormonesPDF 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_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 17376 bytes
SHA-256: 7f32a118ad348ee4b598191542d963fac6ff82d1baea03f74bfad4e55e42b358
font_01_sfnt_off00011975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001318c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318C 11120 bytes
SHA-256: 1a3bcb5fc71a2d5e9bc0f44192f3efdccefbe6eebc20299c7dc6daed704476c5

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