Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5571457a635745…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 03:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c1ea3260fdcec9ceffc32f81273cc533 SHA-1: 7d25aadec5ad271c04fc7fe46ece569d5b43b799 SHA-256: 6a5571457a6357451611271d221c30f64e0ed4d2170134c5e543fda4369ebcb3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and potentially malicious external URLs. The presence of numerous links on disposable hosting and the use of UTM parameters suggest a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=simoniz+1900+psi+electric+pressure+washer+manual PDF link annotation
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ad9364a6a---pinunusurexefesunux.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/jaxedabugi.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/672b4d10ffef0dda2dcacea7b1e21829/gojepuwajenigaxitibuti.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1afd8bced---62159059358.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d70c72ba9b---fugiribugixez.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d59d24cd44---nuzezafigupokirupanoxo.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c71d32754e7---30129935946.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/tewefasamovix.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/raxazibepakatebabaze.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tf1ak4892hc91loqr7qghqbs49/wulojusaletukotikewaza.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/91914a222093047b6f3403fe225d91b0/23905549503.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/58400391741.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/52752965530.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/jagabalesagepininid.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/78776789259.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/edd1c3f6a12e1692d6ad0e60c9724939/lexejejewukagob.pdfIn PDF document text
    • https://goldenapp.net/file/suxifolazo.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/69995791247.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ladojomisufojokiv.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5025124ad---39466711670.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612a17b05ebda---zatutulomumoxujoro.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160af4e17c5d6a---lalizobefigasedokazabuxef.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/2oe29c2tmas225d8d9fvlq4lju/90202706288.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/61994187205.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/funidepudosuxazobonir.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_off0000d9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AD 18572 bytes
SHA-256: 9b7a4c7bad19a8d910db57f33c0bd3f9f3f75e1c5d772343290461fdc9ed35eb
font_01_sfnt_off00010a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A65 11304 bytes
SHA-256: f9f827963a08c9a447df0d85d49eb6d7e7316bc8d8e6e5be2f5793d58e6a59ba
font_02_sfnt_off000124e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1