Malicious PDF — malware analysis report

Static analysis result for SHA-256 67437306d2c6c03b…

MALICIOUS

PDF

116.1 KB Created: 2021-07-08 08:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cc2b55bcfae6c4a96de4619c0082928f SHA-1: 74411a35b96e9431b5df55e8338adcb948b8d253 SHA-256: 67437306d2c6c03bcbf1904c4dabff54791c49b865a0de88fcab85d449beef8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to other PDF files hosted on compromised WordPress sites, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=deathly+hallows+animation+three+brothers PDF link annotation
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/lgebbu3uagp7amm8qhlgh3dfd3/65683991568.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/logamifurenigejepatuxu.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/78830941534.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8320b4d2d---64685118191.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/kofosu.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/rv311l9mfjjaqobr7lkoo924sp/jujalurepugarukom.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a31e932eeda---44281107427.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d433819e2---72801875775.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f328001ce3---4480435505.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b158601ec---nawudikojaxe.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/cltk1ip4pdfqgmfodj1k5sf7bg/bivopexidaxirakepewubeziw.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/92522621994.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/98930598869.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/40037212861.pdfIn PDF document text
    • http://caf-ljubljana.si/docs/xekolekivolovudipom.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/zinaluzolupakaj.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105152227456550.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a96602ede47---58914060864.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d9a2af02b---litotagowasesuvom.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16094dd7e05b1b---vetokiwe.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/32192ea36b79e4040a2214947f6ec6fc/repira.pdfIn PDF document text
    • http://araonline.hu/uploads/file/52845127858.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/356fdfaa039ba41fc20e8fbfe5c78664/muditewadubesajewosezata.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_off000164e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CF7 17408 bytes
SHA-256: 7b2c47f3019c5f483e201336d537f24ea0c0e3d4e0152a2295fdbf7125aca155
font_02_sfnt_off0001aa6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA6B 10712 bytes
SHA-256: c0eb5f0cb28cc12cb158c3b02fbbc191c4a33f5665e216c2353c979e103e28c8

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