Malicious PDF — malware analysis report

Static analysis result for SHA-256 26775301a8a8a1e2…

MALICIOUS

PDF

92.3 KB Created: 2021-06-29 17:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bdb462dc967f65d557086a376ea5b486 SHA-1: 69933fb6d11d4e749b3da62c7781a7129cfaa7c7 SHA-256: 26775301a8a8a1e25ef83fd1ef550bc3fc67424cf85ac192d77a9a02336687c9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The presence of embedded JavaScript and the nature of the URLs suggest an attempt to redirect the user to malicious content, likely for phishing or malware delivery. ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://uetty.xyz/js/ckfinder/userfiles/files/fakule.pdf In PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a970bfeb---remofe.pdfIn PDF document text
    • http://hhcreunion.com/clients/4/43/43f38dc94a4d709fe78decf5bd9d7370/File/7776250999.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/gokotumukuwufusakaguxu.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215311616246223.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/dogawin.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/zunonor.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/pabojufowukozutolexok.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qcnafp4865nfe5b8q98b5u3tb4/98666942615.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbb3195f36---22573429312.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841d20b438b---bipuxopobikunejibonilifuz.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606c9e42cc3ec---11524653707.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a752172deb48c28e7ef13354a3668c7a/72744740626.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608339cc69ddd---98468338809.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/wowidaserimugov.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/ziwurefok.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c1099a975b93fc58717796a6c44c321a/niselosojebesepamagos.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/7fdcsfdapg9mfprnu6rnhpllh2/kumurumaxu.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/rinupomokiserugonitisurop.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608882c9ae914---jozetosapamoxavozozizos.pdfPDF link annotation
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/4l4f1k44v5g1e3afcirasq1nmv/luridugovagep.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/64097262451.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/29rsat8tufsbiq5r4p8neq56hn/solopiloza.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/vedopibilofokol.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/wadimavunaxagekapowan.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/2906282373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=historical+book+in+new+testamentPDF 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_off000104cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CC 10700 bytes
SHA-256: 1b2ec4181323097a70334c71eaf7f709dc0ea164f2b86f9947e2f9b62222d89e
font_01_sfnt_off00011d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001357e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357E 17644 bytes
SHA-256: f896b670544e4b07a49f79fb15aca71736ebfa2493cc851304a8dd71acc27fc6

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