Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffc1750bf77ce41…

MALICIOUS

PDF

72.9 KB Created: 2021-09-28 00:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5670d2585745e4f5197a05d5c97aca2d SHA-1: 247c01116308b60fe314535bf383191f9042dedb SHA-256: dffc1750bf77ce41422b79692e323f456d9661bb132b48d27ea85f0051e0565a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm for phishing or malware distribution. No scripts were extracted, but the presence of external links and the overall structure indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=facebook+for+android+beta+testers PDF link annotation
    • http://ajarnveerapong.com/UserFiles/file/30557654409.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400eb047948---podenamoguk.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/zotawizitakogufebikawaguv.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/27542477587.pdfIn PDF document text
    • http://topp.pl/_topp/file/38792610088.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614f01079f323---83457200522.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/69224540307.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/nibad.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/9854a1a29eb69573edf5a56c2f5efd3e/65757292814.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b64b47ab8---rujofetevuxizezizu.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/29740549700.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/65718604092.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109050105231852.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210923030847.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/j10fqo06r22oq7neen7epg1eg1/pejudadejo.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/9326820479.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/zowupimusatiwukatijavulug.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/vovumapukenim.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/56132613307.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/67527975504.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/55578027948.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/linakumaluguke.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/lataweramapafemagevubeguj.pdfIn PDF document text
    • http://marketingnews.fr/images/file/pirezofubop.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_off0000b5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CC 10632 bytes
SHA-256: 5a55d4b78e18a26b24790377d94ad13258fa3e7aaab26ef0ba636b82b416423f
font_01_sfnt_off0000ce45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE657 17572 bytes
SHA-256: 6e2192075d02a18c1682d6cf05fa6f38e887abcc00036151dfb871006bc28d5c

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