Malicious PDF — malware analysis report

Static analysis result for SHA-256 0638045b27293592…

MALICIOUS

PDF

85.8 KB Created: 2021-09-03 01:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81619644560bf6a53268bb4f023ac5b6 SHA-1: 63b713ad92fdea48b1fba9671f863549e4412c14 SHA-256: 0638045b27293592d8df7263d463b3949cde2afabb902fc3e8d1230637fa1809
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple heuristics indicate the PDF acts as a link farm, pointing to numerous external URLs, many hosted on compromised or disposable domains. This suggests an attempt to distribute phishing content or malware, aligning with the ClamAV detection of Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://benardoutlite.com/admin/fckeditor/fckdata/file/disiwi.pdf In PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee5bd0af14---zokire.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7674b0254---tupapalojukejine.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7266389535---nerukelebafofon.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/55494426933.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/29139425622.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/jetupixizipav.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/negugovakoguzuli.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/joon1ma95jf1vshngvk6a37ifb/56112052329.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ta01alf4af838ft65u3h16ad5h/8039711774.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/jobugibujakatubelomed.pdfIn PDF document text
    • http://envigest.cz/upload/file/pewovujigotoluri.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2c4d34477c5259b4f461cf91676f38a3/67294371277.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/c5lflhq579qqn370he84lsdevr/1775867699.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/70982842281.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/39131607851.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607638dda9c71---devaxeterukowonoxu.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/94488099746.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210517160925.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/46867306350.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae27cbab4ed---5600652963.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/103c3620cb4689345508992a58719dfb/44590438711.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c43756ec70e---zarenoxibarexigowukubi.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/153d327910a57646db24eba1f789f7d8/3444795843.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/27232355776.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/mobexidejewevotobumetix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=imunologia+abbas+pdf+completoPDF 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_off0000e366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE366 20648 bytes
SHA-256: 6a2cc1d7a2033f94f31df6d75e5c14833754563aa298a1eb3ea7d206d4b88f46
font_01_sfnt_off00011921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11921 11052 bytes
SHA-256: 1e179a80d848a71725adfa0b580dfa8950c85704401fd8850e02933174ce5fc3
font_02_sfnt_off00013270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1