Malicious PDF — malware analysis report

Static analysis result for SHA-256 a691663ce5688d61…

MALICIOUS

PDF

73.4 KB Created: 2021-08-29 17:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 10f8b781c92dc7c46f893108bad7128a SHA-1: ad4bfb4772fb8f95f1f7ba5fa8bef5dec180b041 SHA-256: a691663ce5688d619c03ca0669d3c31bcba19bb9d91c6989316923022caa376b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a likely attempt to redirect users to malicious websites. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://oniceh.ru/uplcv?utm_term=the+function+of+a+behavior+refers+to PDF link annotation
    • https://auto-rujo.com/images-editor/file/18492354062.pdfIn PDF document text
    • https://forumsevens.com/images/file/34729034219.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/71374998258.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b6f85e03fdd870277e709b0c9fb8b9da/65117127814.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/dawugezibujukijega.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca85273c62---92673438114.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ks43obf8ct41ropak9rdqgsbi4/wifelinolemediwitusut.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/85590102651.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c696b1087---bopisotaxuwalifimunudizog.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/tagonewubeguzaxiragejavov.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f744fac3471---84038364808.pdfIn PDF document text
    • http://princeverma.in/uploads/files/pabobidi.pdfIn PDF document text
    • https://digiconelectronics.com/media/lejubokuvolavufe.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cfdb3aecc---pofigisexoxav.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/rpa1705459n4fvinm4acmomcah/41554771631.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd6211b17c---juvovawugisurikale.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754f0318ea0---27986580736.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/wibitubu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ba60dbb93---movan.pdfIn PDF document text
    • http://abpaluso.com/upload/file/dujisuwotukofebiwusili.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/bchqinehkrj5cithm5sgf9itmf/gozejedozimoruzewununez.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/xelupafuzesopukasi.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966f03afcdb---96656963336.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_off0000bd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD531 10656 bytes
SHA-256: b4536d94b066a8e99961e722d5249413faa7592b3e02b3590f090588eaa97c12
font_02_sfnt_off0000ed9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 16420 bytes
SHA-256: 4953ddef08853cf3b63b22f375626ea943266ae1991bf7ac7d296d0c499e026d

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