Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed650b1e4733b044…

MALICIOUS

PDF

74.8 KB Created: 2021-09-24 11:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0260074a1aeb256f2b1e5a75f66b00ec SHA-1: 4c669e84c6eed2c0054998c910c3e7294a9d9670 SHA-256: ed650b1e4733b04491d28446cc3fd7f51b9dc7b53dfed9697f5dfca453c37f62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external sites, some of which are hosted on compromised WordPress upload directories. This suggests an attempt to lure users to malicious or compromised content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://studiocariola.com/userfiles/files/madafawudatud.pdf In PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/jemifesawuwimewaposom.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/19080412242.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/34583688480.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/gavukuzu.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/67410064726.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/14c6d9b480378028cee880b49d155276/75464389572.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0aa1582da---32901315550.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/pigoku.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/zobuz.pdfIn PDF document text
    • https://123natura.com/stockages/files/jejixuzeveb.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/5bbada26dc534923d9088da5c4f1a2ec/tefefafirogakemavup.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/79310344150.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/2f7ef2beed7dcecfb54fe55b6b65af0b/708707170.pdfIn PDF document text
    • http://punaide.com/userfiles/files/nolixubigokefisefile.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/84843158234.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/44481437416.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/95769158351.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/87702663270.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/45593094128.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/68908348326.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/pimobiworimeduwop.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/8429359990.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/nizawozawulije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=hatsune+miku+mermaidPDF 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_off0000c35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB72 10428 bytes
SHA-256: 1786ee51a91448ccb1017e4f53c940225f6459715e90eab15a45242e87c31b03
font_02_sfnt_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 16672 bytes
SHA-256: b10e717463562f4ce30890c026d073319fa0cefc125a0246b196e76ffd0e52e2