Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1ac5192ac0114e…

MALICIOUS

PDF

107.5 KB Created: 2021-09-05 18:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 55a536c3670015249b24c96aaad6c237 SHA-1: 7d7b7cb77942fbeab13190cbeab3cd3d4e76b87c SHA-256: 7a1ac5192ac0114e0c74775d8a6693f3c095dc34cbb5ff3ba9ddbf40639174d4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests the document's content is designed to trick users into believing there are changes to payment or banking instructions. The embedded JavaScript likely facilitates the redirection to malicious URLs, which are designed to host phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=cerner+powerchart+ambulatory+pdf PDF link annotation
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/869b1895e710b68f654df4041a0b11e7/82858385350.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dae1882160---sasolofazedowuxujife.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d201810ea---losetifuzasoziwexokiv.pdfIn PDF document text
    • http://xtra360.net/campannas/file/pames.pdfIn PDF document text
    • http://tw-go.org/files/98932739607.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160947d7d83a8d---pokenajujariteboxorowiget.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/kopuzagurixesu.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608642a0b941d---34864065980.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5875ed62d47102fa6b0905755216ddce/mujigewupuropatopafa.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/jakufexa.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/34105986210.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/8489000127.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/zemeg.pdfIn PDF document text
    • http://mahlkoenig.nl/app/webroot/files/userfiles/files/68733218855.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/70239983623.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/34eb418190ce0358bd524c68768ef1f4/22390013707.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/55205651221.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/5dc8bf519d9d1fb547c848cd5ceff430/74091799575.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/42754015780.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/mofadinepina.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/62925002933.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/62406146356.pdfIn PDF document text
    • http://yarpaket.ru/userfiles/file/jijilufaburoveginev.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_off00013e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E86 18504 bytes
SHA-256: 23809d8c551e2bc78a62b035a851bed29d2559917ee4dcd46b4f556b184c88b1
font_01_sfnt_off00016e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E0B 11096 bytes
SHA-256: 0e36bcfa886be083ca5c887cbc2a21dcd6b22391502de452af7029518fe42a12
font_02_sfnt_off00018793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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