Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eed3efb6532428c…

MALICIOUS

PDF

75.0 KB Created: 2021-09-06 19:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d9c9862363a1322b8dfa80af14bed4be SHA-1: 23aa87df4a990648ffa12fcf68ff32a699a22eef SHA-256: 5eed3efb6532428c2e4e90a9994827d957aeac86423f9fdacdc6c6fb5080070d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The PDF's structure and embedded URLs are consistent with phishing or malware distribution campaigns, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • 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.
  • 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 http://dogable.de/userfiles/file/7029123313.pdf In PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf1dac9d03---fefisokasulelisodu.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/f26286cdcb4ee73d097d41042467efdd/zugufodudamo.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/cvi44q15hi3g2br7le7kh1gni1/75331230552.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/e0317933d8b2d1a74f2933d0b6983fae/lisopupirufewow.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/1748184119.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/78221402375.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/odaihv0a87uf1tmhrg0p38sepm/bonojikilopepevibin.pdfIn PDF document text
    • https://ksboutlet.com/file/files/23416631481.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/be486377f093175ebdff2169ac99b4eb/44887705861.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/4jjkcnm6005jo98iatmviibrf2/tonod.pdfIn PDF document text
    • https://medtek.vn/storage/file/93358445733.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c396ef94a54---nemiwikowiretoxijukapijal.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec2237b78b---xasabinimupivar.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/19230766862.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ahki04c0sq0ouq07cl4lsgb3i2/notelepimusenusomadotanav.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/5d8b7c08621c40695e268004d5771fdc/62985691852.pdfIn PDF document text
    • http://schokobrunnen.com/idata/wininazakixetigaxew.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/93996645120.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/s5nt71hv7p6c794lgdlm4ubi12/zalegaxilu.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/14762126985.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210812_96E46DDE2B87659A.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/tosebizewezelebeve.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/92313428702.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/68ff8a8f297a516300a90708b3cafe9f/3327998577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=river+flows+in+you+piano+sheet+music+free+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5FA 17732 bytes
SHA-256: 18930a917b65efef74ed17deecf2663b7e80f38cbace465354096e23d4503caf
font_01_sfnt_off0000e330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 11296 bytes
SHA-256: 4e88ef847619e44cd8fb3479908b1d3901672444ebcc677c81ea810050f7ded6
font_02_sfnt_off0000fd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00010595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1