Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fad15a0c639d510…

MALICIOUS

PDF

76.7 KB Created: 2021-09-06 21:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb3c193470e4339f76c198b9f3fbff8e SHA-1: 0682597769c7d5a5c94cd83b5b34d22d66d5d874 SHA-256: 7fad15a0c639d5106ac2383d1742e118fa0a52f1ab1ff7851ff95c88557a73bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, directing users to numerous compromised websites and disposable hosting domains, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded URLs suggest potential for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • 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://nfc-lampang.com/user_img/files/46725087206.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd27485393---6090214597.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/rfglhb373khhs75v8e5rjmrdmh/65974551617.pdf
    • http://rogo-rotterdam.nl/files/9203318919.pdf
    • http://simpelms.nl/userfiles//files/siregosusulemolo.pdf
    • http://1carl.com/userfiles/file/fukiwadewamotoxuxeju.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1d614789b---dajodeti.pdf
    • https://efnnma.org/files/file/pikixenefibafazekipul.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a431bb984df0ca90f849f7e3a74182c8/jatukusevutokole.pdf
    • https://asset-books.com/userfiles/file/tedapasodomijad.pdf
    • http://fautographie.org/images/userfiles/files/zulikoxivunowaxakop.pdf
    • http://animationcoach.com/userfiles/file/33654032162.pdf
    • http://sllight.ru/design/img/upload/file/balurekawigepenop.pdf
    • http://kameleonhastanc.hu/files/file/37308933521.pdf
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/xazapeguledan.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b84faf2031c---kijoxilevumigeposezaw.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f384950145a---88854883296.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0f13fba1369729ec054863505d38311e/68025697978.pdf
    • http://hutergroup.de/userfiles/file/tibekesobinagulegovi.pdf
    • https://fajndoktor.cz/images/file/files/bezikaruzazagej.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/vtim7nbrm12vrc5lqvl1438amq/jatujo.pdf
    • http://www.jfac.kr/ckfinder/userfiles/files/kifoxusegilumaluje.pdf
    • https://a2designbg.com/userfiles/file/80069438300.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/3hd6duuuuhca0jciehms8a0lpk/19674091432.pdf
    • http://studioarchperissinotto.eu/userfiles/files/74084442845.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=dcs+f+14+tomcat+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6ce.bin
3f7fcf663d8a8f0c5ad0a2f01871c1a70bcfff9be4f109af60cf1f05f890c923
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CE 17880 bytes
font_01_sfnt_off0000f586.bin
6b9f0664082f38750cb40cf2cd1bd1c7bfc844afcb9299ab05dc82d4aab6151c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 10404 bytes
font_02_sfnt_off00010d38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D38 16792 bytes