Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22f4292c94cef10…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 15:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8cad64806488ae65161bce63a9bc1d82 SHA-1: b0c1420003103564d5cd6782dada700c7ed67198 SHA-256: a22f4292c94cef107a6e2109150ea61fbababcb9da3810d388268aa18137f21b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that point to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=instalar+android+en+una+tablet PDF link annotation
    • http://sellmysayarah.com/userfiles/files/98766673863.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/wiribofe.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/34390618746.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/56960429219.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf1507ec9c---47985366437.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/89995990356.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/gakesimemelemapuluguv.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/bik9dtg7ofqprlvt1sls3ldf6s/lazezabatete.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/21823111704.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/tetokoz.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210912_1A1961F7720CB497.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/72656298511.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/zuxuw.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/bavibosuxowotakuz.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/somisu.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/58527446134.pdfIn PDF document text
    • https://85097781.com/upload/files/2603565157.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/tixakiwakukujofutofener.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/vidapatezofaxe.pdfIn PDF document text
    • http://medi-sen.com/files/files/8789973340.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a6331d59f09b2c4c83594692bd3cfaaf/pemibarajomo.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/12242167474.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/61425014413.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/wijetufixugakakutomixoje.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/woxakunofutosekexi.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_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 10432 bytes
SHA-256: c901bd47ea07f2661e1500c4e3c088c113537d411d29365a0ba030d8a0a89b9c
font_01_sfnt_off0000f874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11086 18160 bytes
SHA-256: c502704f0313f7321b3926e859c89f96b0ec0897f6cc42f32a2590c198f5f1e7