Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d0116cffc56e440…

MALICIOUS

PDF

90.4 KB Created: 2021-09-02 01:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c7f7cd58d617ac8d8c3bf1e59b9fa03f SHA-1: d18e6287122e663a54d2a00373055597bed0a924 SHA-256: 6d0116cffc56e440bdf69674a8e0093d320e738b135406090f092de401c6c444
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to PDF files hosted on compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 5

  • 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://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a27648b3c---lepibozokuno.pdf In PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/wolovuxawogafoduga.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/61257068260.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ac2a271dc---62697741801.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/gewademuzarekapoxiga.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/35198178127.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/denopimipibiv.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a25b7bff2fff1913ed11eb6e89af1948/wopuxeresegi.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/nixenizisiwipexomolasebez.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/zidaguzigeturi.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/rotejesowazis.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/83265416332.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/3153912439.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/pasakibojelug.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/sunizigak.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608763b47fbac---momiwadiduj.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/64639422367.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c3fff3ac1---wajokenibumog.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/36725447677.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/zupogemenud.pdfIn PDF document text
    • http://jar-ted.pl/file/gepozifosafejaveb.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/62716441248.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/51461421836.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/6686573376.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/81556724502.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/36473928921.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/36086802075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=birches+poem+meaningPDF 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_off0000fc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC45 18820 bytes
SHA-256: 3390b3f5a2cd93eff64841f336d03b2782e34a0ddbd3c94f1118367ffc0734bc
font_01_sfnt_off00012b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9A 10728 bytes
SHA-256: 223779ba17ef278310236a82413f07ad48dd884d13e5ca125fc0b1cbd7640bba
font_02_sfnt_off00014419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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