Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28fa57180dc9ed1…

MALICIOUS

PDF

88.8 KB Created: 2021-07-31 22:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3b14b2122a9597e94e3f646f3f67f783 SHA-1: 9b162b677bf021ec2080b18a3be368f52c420035 SHA-256: f28fa57180dc9ed1536d70667860d2a90162ac32867999c8a6f184835523c763
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or appear to be disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a high ML score strongly support a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://biznesfishki.ru/files/userfiles/files/44797254286.pdf In PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/52560028601.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/46624171703.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b9df66c1d9d---52005482719.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/95938784109.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/sg5d7cg8e6n4oebo8k0bjjinh1/palivu.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/047b38655021cd5267e219a2bcdd5f53/navufekovofuze.pdfIn PDF document text
    • http://mosjob.ru/images/file/zatabeleduwu.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/22a31fe2c890b5d4ad32b43dd9a7fb74/22071435111.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d80da3cdc52---wituwatalobimo.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/gotigosagesuzasole.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/vivonoxanisibuzabetej.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/f97f4cfafdfccc3c33e75e952d44b300/tezunaguwu.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/58d54ffb9c14860c6c694916772c57bf/tojojopawutopisawo.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210721_E3A8A6EBCE04653B.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-16/20210516181651736964.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607175d31b938---bowelanozepanitavupebu.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/gigare.pdfIn PDF document text
    • http://alkanboya.com/files/file///691045601.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4bf337a71---79220072467.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca6fe9d4cd---netulisixupipusetusok.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/tatumodamimilowozemu.pdfIn PDF document text
    • http://budka39.ru/files/25762503903.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/9rdcs14okdhu0j5r77kitsppjk/wadikegexolopivef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+write+a+video+call+in+a+scriptPDF 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_off0000f8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11102 10648 bytes
SHA-256: 9a30e78343331d6f6a9c12987b2ff8ce3362b1144304cd62074d8d27e4607b39
font_02_sfnt_off0001297f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297F 16548 bytes
SHA-256: dee269f7f4dba861a01510aaaf9e502921e218f0b1c3acfd29ca0f7c1b5b94ca

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