Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37a748cee4ba18d…

MALICIOUS

PDF

80.7 KB Created: 2021-07-03 17:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b25771ae1895ccd3f204efce66dae6b2 SHA-1: 22b86ac4cce1fd5dec10853bea37e70df3f7f986 SHA-256: a37a748cee4ba18dbc7079472e3d3f6b3be62f357ffa78ce768ab477b7b07ad1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://queure.ru/uplcv?utm_term=tingling+meaning+in+english PDF link annotation
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607beac24fb2c---pokozewatiwobatimij.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02c284d2b3---bijukajowos.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/a535ec5f20fc38b534844ab52e8bc376/53110991857.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac798c21704---gimozorusezowewonofemeto.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/85192103069.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/a8a7755a9c4e72cf658eb8e762dd1f47/mezelobozob.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/52640f255030442279a213786c15b3d7/bovemerinijesuj.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/bfb3a9f7057d5265bc4c7f14a56d6962/jowurapidojibidosubu.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/550de1f001c84492c08de5acb6e5fad1/92212981484.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/pifavugesub.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/29576761d753814b7175e1d4a3fae556/67588485966.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c895ed2735---gofiwalaxikivip.pdfIn PDF document text
    • https://kildevangen.dk/files/zotakirirubuwivepowujag.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16089b1fd311a5---56072383233.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/kubipuletapanadozebifa.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/23557682735.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f63d69e90f---98504766939.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/51eb9309e9ce302c7a679b8cdc9810f3/xufosepesojife.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dffab1283---nisokekezi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b999dba2e9c---nifovonaregogerow.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/nikugezirelimirebe.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210604150927.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/0b03224be88860a88b90e10520c90222/19337384973.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/i10q5a0lvsb0a4712h1r27shsa/wogobusawepisateguv.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_off0000d6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A3 17696 bytes
SHA-256: 7d69c051ff67b900b2ff0b3244c51736faa3c76335384f6c2df7b0ec65458fdd
font_01_sfnt_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D36 10200 bytes
SHA-256: 80d4e6c620f80424114d5c184f3056b08e9f1eb13a430de1e8b075333ea2813b