Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8c16358541b519…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 22:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8fb32337f5add7f7f27089f27314d8ef SHA-1: ae7d456442cfbc3fb628c3b7a1c0e44a6e82ebba SHA-256: bc8c16358541b519191cc374587fea5f3b7e8ee0ff22bad06ae2639c2da855f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. These links likely serve as a lure for phishing or to download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nomylo.ru/uplcv?utm_term=belcor+classic+air+conditioner+manual PDF link annotation
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/be042b8baa3b2adf342bd72eeb45c39d/4177375132.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0ebaa107c---45935739850.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161255e38300d4---17682171886.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/99f9f9c5cfd39266ea32ae8bbe71a74d/20232334961.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094e7fdd1386---morirositirixurevoma.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/6fb0f7ebf02253939f65b3309d4f5840/99883690320.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e33d719611---jezetabowusojotutamukuxu.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/11952741010.pdfIn PDF document text
    • https://senhewood.com/d/files/gavuwikalukefa.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5dkugi4pvemg52co02enibbe8r/50667689308.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d9a63f7f1---58108060150.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/lexiwa.pdfIn PDF document text
    • http://alkanboya.com/files/file///7930687579.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/nuvexisigagozovivin.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/9e9ea8ef15cdec31c2d38fb4ef495f64/99681141363.pdfIn PDF document text
    • http://oodow.cn/upload/file/210824042621939672rgc8kjygte1i.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/5r6a0iml08uj6eqqf471as1c90/zezodatadavinixigojaja.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202105301620412723.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/34731856748.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc264be4ef4---mejusesar.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/xasutifa.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/liwevagudokid.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070964de1950---21081537281.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/66697098306.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_off0000de64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 10684 bytes
SHA-256: 4afccce545f15071c7d70de74154dc7cbd9a83db743c3a5e27ba6bc64d684b07
font_02_sfnt_off00010ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF3 17292 bytes
SHA-256: 746229b7b4eabfa0ec54b023379b2ccb4ad4d1f13c23f4d806ffcaa62a148d16

Open this report in the interactive analyzer, or submit your own file for analysis.