Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d805e53366bc48…

MALICIOUS

PDF

87.6 KB Created: 2021-08-01 12:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2405ad5e12662929f788636044a27b95 SHA-1: 091e11341ab072d7731c4b027b90adc58058d314 SHA-256: a6d805e53366bc4883c59dec3b67ad8303957c300449d7a67c2d73a606b3f282
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs and link farm structure are sufficient indicators of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5b6a54b66---7968261310.pdf In PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/bowujosekog.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce81c33eae---6043261231.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/vboffphpash9qa8u2rktid5q6i/56946398621.pdfIn PDF document text
    • http://suaups.net/userfiles/file/60441274425.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/gubatajesufaberokor.pdfIn PDF document text
    • http://atek-ent.com/upload/file/26484406823.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a320a1ca4f0---82470703128.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/e7f045ab29244e1852b1b1ce431d58d8/pakewixapugazixawag.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/22987004073.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16105fc1a9394d---vewudumop.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/28591906821.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160801777060f8---nigebuduwami.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc7a8ba440---kaxedijebafi.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160923f2f23ea2---memeriwegunotabojunidefez.pdfIn PDF document text
    • https://schmitz.cz/res/file/46698463982.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2d37c0798---zezexifewavurabakofurosar.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/20236583268.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/lavapaki.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/b6ggbqks14snpkflu5e3b26psv/wuzavefowiduwubigorufunem.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/5d68gg2td3809bok3ph0kpi9j2/25310560462.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/17834116084.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/sibidemurov.pdfIn PDF document text
    • https://mytopics.it/uploads/file/mekaderad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=lg+inverter+direct+drive+washer+dryer+manualPDF 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_off0000f32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3D 16572 bytes
SHA-256: 83ebacf2e27065af37eb39744c906e9237b20ef260eedb2d0bfea284da9d7fd2
font_02_sfnt_off00013642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13642 11020 bytes
SHA-256: 7bd1d117551193163d2b0ccdb97ffc69e50407e3e775311108c56301a89597d3