Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd0557586759385…

MALICIOUS

PDF

86.9 KB Created: 2021-09-22 19:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21a6f6e5c4553741f3303192c352aae9 SHA-1: db113d80a93801a752576704152aaf4d7b5916a9 SHA-256: 2fd0557586759385064b44286707bbda2764c1d97471667b178ed44579919608
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript and link farm suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://queure.ru/uplcv?utm_term=dua+for+uncle+health PDF link annotation
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143debd126eb---zirutuzaxorox.pdfIn PDF document text
    • http://jawarakreasi.com/file/90212523711.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091417145980.pdfIn PDF document text
    • http://spbi.cz/res/file/xukimofote.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/zapabiloregepivabilezu.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/vavudi.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/zusidugageke.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/kowidaxixux.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/3a119174dc38292b4ff990d6a2acddaa/27280227055.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/gevokufuvavakomufomeka.pdfIn PDF document text
    • http://k1a.ru/images/files/file/zasorokutabupibagezikafaf.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/41nh12di1oe92hioooodav5fqg/39215184788.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/28444082109.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/kewabakikoruporitak.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/wawasupabakazejod.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/47635203659.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/8941760749.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/sulerobeduke.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/zazaputuwugasenoretuxe.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/20776489698.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/fofivunifunexerizefifal.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/sisedewunoj.pdfIn PDF document text
    • https://pbanerjeeservices.4digitmagic.com/userfiles/file/87162692722.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_off0000e52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52C 10276 bytes
SHA-256: bd59fe154b3c6d0e54e162693a701953621929a096bc599312a97d70d82b9bd4
font_01_sfnt_off0000fc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC40 22400 bytes
SHA-256: dea355039112e42105d526b85fbb8b5459ded8e9e7c5ceb9c1679d4ce08e4c30
font_02_sfnt_off000135ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1