Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2136d0a27f95b3f…

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 01:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9d04a1350df99fd35d79ba9456b69222 SHA-1: f55dcec5da426067f90a3e0c7a22383818c81931 SHA-256: d2136d0a27f95b3fe16447525a9ed403b3436b5fc03f5dbb3875b43d65c4f0ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a link farm that includes URLs pointing to compromised WordPress upload storage and other domains, indicating an attempt to lure users to malicious content or download further payloads. The presence of embedded JavaScript (T1059.007) and the nature of the links suggest a phishing attack vector (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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 http://e-baze.lv/images/site/file/85409309845.pdf In PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/wedakalomo.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f81b7b978---zilukukojaz.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/fetiguvixig.pdfIn PDF document text
    • https://www.ocnistudio.cz/ckfinder/userfiles/files/numedo.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/fapafez.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/rigoralinakidelumabufu.pdfIn PDF document text
    • https://venus-forever.com/image/files/32401900312.pdfIn PDF document text
    • http://chromoink.com/updates/file/51531101093.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/nununevilidibeda.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210916085307048727egt9k2.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/acpo7008hui1slfcse2e7fec16/23792526171.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/dutelelididazidepazibir.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/tubevozunamut.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/wopoveguresukige.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/wazodifolinowevafosatiw.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/52710597333.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/77899049849.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/talominitovuxani.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/86994630121.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/vosofuxotanigozifamuwu.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/limuzadebuxu.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/vosenuzeregidimazizugip.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/455460248b06c842b83f868986e27e42/23118904651.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d160ea0f71---gulofelosakesidimirofez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=minecraft+xbox+one+good+seedsPDF link annotation
    • http://www.thaiticketmajor.com/static/imgUpload/files/55844132559.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_off0000e425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 17100 bytes
SHA-256: 58d4f0529aaaef0c86c7f968877722f2e84e17cc5804b4cacddcd76f0dced67e
font_02_sfnt_off00012899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12899 10840 bytes
SHA-256: a65636a3096f6a3bab0129a56595029d0f84d47d1f3c2fb7ccb724bdac91245c

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