Malicious PDF — malware analysis report

Static analysis result for SHA-256 426be7d269adaec1…

MALICIOUS

PDF

97.1 KB Created: 2021-09-18 23:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e2a6959d9c030c5c82ce092d067fffb3 SHA-1: 1116d7db93b0367ba8fb9ad7e8e0c6f0058aaa4d SHA-256: 426be7d269adaec1a8bd26a4fbbec262406fb60261d879d03c738d90c695e221
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://crysiq.ru/uplcv?utm_term=mass+effect+andromeda+patch+1.09 PDF link annotation
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/68930740763.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210902141158.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/nifurinesojokikizuxofigil.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/jonozalov.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210917225954.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/demenixavuvizure.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/wawiduvoguxekivuduk.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/sijaru.pdfIn PDF document text
    • https://arendic.cl/files/dobiketagaximiwetokujigo.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/fafulalugejujedajejos.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/lopagagoninixaz.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/fawepejilutetitu.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/51244100339.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/70137120802.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/94137668968.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/bojenuwoz.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/tikirekuredetimojidev.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/27443186588.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb3a790eab---sinenipigisugiduxikuzevu.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/tatimigiwazemugodipuzek.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/eff170e1588f3cb352918a7f3884a562/vikuxa.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/27516876161.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/97413571345.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/wugosegejinugaj.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_off00010d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 21304 bytes
SHA-256: edc0c7abf83f610194848af0fe3a21f12053e13b63620f5bc847b48bbc5b679f
font_01_sfnt_off0001447b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1447B 11148 bytes
SHA-256: a66a6bd2ddf6aacf0f31bdfc06ca338d0559228909f045e6b31c767451b337fc
font_02_sfnt_off00015e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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