Malicious PDF — malware analysis report

Static analysis result for SHA-256 81754a681e4018f3…

MALICIOUS

PDF

83.7 KB Created: 2021-08-18 15:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f3947fb3a8483561791555ff801a9e15 SHA-1: e0211f5e94a24b8f0872300e5d8bca72cbf678ec SHA-256: 81754a681e4018f3b057df4ace488d1cf77978a58068bab91ee8fe902ae47575
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the heuristic findings point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ke0fkmudciedup682r2rgkmdnu/turodefuma.pdf In PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160982f83c462c---tonopukisulozu.pdfIn PDF document text
    • https://avvocatoboretti.it/file/66743863276.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/9675560226.pdfIn PDF document text
    • http://signauction.net/userfiles/file/62185041310.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/80566211253.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/39180380691.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfceba45a8e---budugamalopabisejopegubez.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/pvkvrvqv0k1v4ptmf3i5u52ce4/rawemunogav.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160abeff9d5411---79280020190.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/3506c45ad9981f4deb984c76d9336ee3/59978171761.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ah5ialpr6jiuauedmbj9ei2b3n/waxelovatojonijef.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/zomirusoxugun.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097a96faf08d---jixaletesubaferoxutoj.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2ebb7a852---kukona.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/gazedanaf.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021070414235873499.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/eca938a14e06c8160ead2cfcffcaaebd/95166274212.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/n279jtror62hdi2h6cm7er0ko2/legubobaj.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210705055559.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607c157ae93a6---rusijiwalalibopusunonaj.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/doreroxerokufefiba.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/xirolakinasagoredipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=blood+sugar+level+chart+australia+pregnancyPDF 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_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 16820 bytes
SHA-256: 3e76d0186b115b6c2dfb4a4dc663be1b09b527a236f555ec06c7577e76e28c2e
font_01_sfnt_off00010e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12643 11128 bytes
SHA-256: 3ff30228c251a38f2ee45e875824d60fd30fff9fe957fb61e2a0b9b8e921d11d

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