Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c140d64a42f393…

MALICIOUS

PDF

76.4 KB Created: 2021-09-19 06:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 12839d48e5155a3f0e0593454e2ea441 SHA-1: 4395177962d233fef1a4ae3710d0379970abb760 SHA-256: 38c140d64a42f39329ebf66439d3206826ff0ef00d421a36c92444f745c11b68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on domains identified as link farms or potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and the nature of the URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=wrestling+revolution+new+version PDF link annotation
    • http://olguanaokulu.com/upload/file/vupileviromonado.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f38812c453---gimefiwulepijulepupamox.pdfIn PDF document text
    • http://lex.tj/img/file/derubaroxopipovero.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/77578349372.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/64060001612.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/zazirupiw.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613eba88f2cf2---vogufigamufadogede.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/4725952002.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/woxumuraxupebojosodev.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/8777293304.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f0f848409ff496e21a90bdf2b93e94c9/18083509487.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/66741347607.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/nakimerejokowidizalagu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614679b74b0db---4868157489.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210902_160400_1820.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/69606438330.pdfIn PDF document text
    • http://ud2-140.com/files/157191419.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/zolamubofidefuzunuba.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161460297ab8cf---52042056406.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/marevasezi.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/jileto.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/92051945337.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/19p10uv4t2ospj2442kqbrpalm/lokibujenedederizeteba.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/garipumoxa.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-6/20210906151513989596.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/bigapizepijinife.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/nuzamegerusejosefafa.pdfIn PDF document text
    • http://sbairs.com/datas/files/56987198246.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_off0000c7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB8 17120 bytes
SHA-256: 5c2579a2484cd3099fc07378cdfd4b51b89ca892ae036b9f6e1252da34554b87
font_02_sfnt_off00010c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0D 10364 bytes
SHA-256: fd0eaeb6d92b2b2fb3f3b57d8df8c859f8d2577ba114bcf4b2de81f072522fc8