Malicious PDF — malware analysis report

Static analysis result for SHA-256 1157edcea3ebe21b…

MALICIOUS

PDF

76.0 KB Created: 2021-09-07 23:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8d2ab78acc09dd46ca7a22634270a6ed SHA-1: 6ba7aa4e95d633e79fec16c8623261c06eeec6b5 SHA-256: 1157edcea3ebe21bae8a373075b4e500bc097fa166005d40623235295938716e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. It also contains numerous links to compromised WordPress sites, indicating a link farm designed to host malicious content or facilitate phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e183c4db1f1---22407469061.pdf In PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d0434732fe2030c644838217395fed1a/milezepafek.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/vavuvupapip.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e4b5bcaee90b0c87c3156b6caf1e3583/23787726633.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7ccb21052---90117761621.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9c62ec776---20920835250.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/79072524419.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/jajet.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/15982591426.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/44365625924.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841d20b438b---bipuxopobikunejibonilifuz.pdfIn PDF document text
    • http://blackwingsexpress.com/upload/userfiles/files/81206899262.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/rugitimorolit.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/4dc20259c73656612c5d0616550a4c43/futodarakovalimadiwusok.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/35489472605.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/5c6t80da2idg7gt15853o9ddn6/92892697825.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/58762841465.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/tarakoxiruwiwelavud.pdfIn PDF document text
    • http://compsult.net/userfiles/file/29292201407.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/6492840579.pdfIn PDF document text
    • https://masihpt2.com/contents/files/dosiritokirunenedigopu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118a7801fa01---tiwuromajulazizetitu.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/zafumobubenib.pdfIn PDF document text
    • https://xistenze.com/files/files/punitanuxapebapitofisape.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608c901d3a194---jemifumisedokobiwinaz.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/81660316818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cuales+son+las+culturas+prehispanicas+de+mexico+pdfPDF 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_off0000c3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BA 17720 bytes
SHA-256: 13df217881fdebed197b911629ef9cdc46f9adbccfd39644c9fcd31c426a79cf
font_01_sfnt_off0000f06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06F 11120 bytes
SHA-256: 439c06e212b72774b9ebfede30867f80bbdfff5fe31787208998503587f35904
font_02_sfnt_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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