Malicious PDF — malware analysis report

Static analysis result for SHA-256 782536dab394b3e1…

MALICIOUS

PDF

87.8 KB Created: 2021-07-25 02:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1aa8e47e6ba2c344802c6ebee133cbf0 SHA-1: ede5cbfc0f82d8b976fcffa4df78fa525f268f4b SHA-256: 782536dab394b3e109cbc7b02732331071c792da948f845965f0fa19c779b134
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress upload directories, indicating an attempt to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via a link farm. The presence of embedded JavaScript suggests it may be used to further exploit the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f2a615a6---movejudupikarajiza.pdf In PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/xasopanaxizosuwulaga.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/gokisegeluvibosif.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160883722e7fdd---kekojukoguno.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b04d75099---13116731796.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/cc3568de6eff7be84de7f9de2e1860b4/bagidoxebogeboremo.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/zajifoke.pdfIn PDF document text
    • https://mszukam.pl/dat//file/jofirewilo.pdfIn PDF document text
    • http://schokofontaenen.de/idata/85076232719.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/28354243934.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/pewisonodevugutomotab.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160988e064883c---26619985324.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/5bca2030d8d55ba03739bae9b7b87712/sosamolito.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/34807088640.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b30ce29ccb67a0921f98c86691f4951e/35949513228.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/01166167289c32220de4ceb33e069c43/nobelobadelapipunaf.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/6495e8469d616dec7cfd63c0e0768748/wukuxibetisir.pdfIn PDF document text
    • http://mooneyes.pl/userfiles/file/16045069127.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/baxekisukolurojo.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/34316490668.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160772bfdb5919---16931988669.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/pepegaxut.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/33dbc1173cbf5f4305e940e557708ff3/dizorijemakenawe.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/12053750013.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801eaa649b2---13098708577.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/kimara.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/19953499010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+is+the+best+skin+whitening+capsulePDF 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_off0000f386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B98 17136 bytes
SHA-256: 7aaf7e020fea69d8f069029aeb1703c59c01f5ea2e5d55ff454ac63a006039d1
font_02_sfnt_off000137fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FA 10844 bytes
SHA-256: 96fa19f5d99b706d7823d9b558d335202fafba6cff3eaac2c9f74107aa80563b