Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb29fea068f53a6…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 22:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53c5cf9099737d1b905a1e8a856d314d SHA-1: df6f76ef65b1a12acf4a577dec1fab6bad0a4b34 SHA-256: 5cb29fea068f53a63aaed2ee2af71cddd6d1d43b4be6bc8842e5bb237667b6b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farms points towards a tactic of luring users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=pokemon+go+how+to+spoof+android PDF link annotation
    • http://weddingdove.tw/uploads/files/202109141647401907.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/dasavijurowisadinuf.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaef35558a---wixakuworudim.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/widixewuxanuzonogusejomu.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/nakoxafigupuzisudo.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/xedazep.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/dujezunuguzetog.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109161908132013.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139259c5bcef---lesapomugazadov.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/34625237525.pdfIn PDF document text
    • http://banquat.com/userfiles/files/redovaxapu.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/nofizamogofifuvutararugaz.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161411b4c02f00---suzodafasevesugovawim.pdfIn PDF document text
    • http://czyxchem.com/upload/files/futegubujofukeli.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614034898c7d6---24654806874.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/67185526993.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210904053505.pdfIn PDF document text
    • https://fasleh.net/Files/files/41079986034.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/1274020283.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109111853221124.pdfIn PDF document text
    • https://somogyplusz.hu/files/sufimezuvorer.pdfIn PDF document text
    • https://paperland.bg/uploads/file/dalefigivume.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///zesagidurer.pdfIn PDF document text
    • http://gekon.net/userfiles/file/jusejabe.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_off0000d1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F5 11076 bytes
SHA-256: d456d8baa87099a77cad4c675191307b70763384eb832f585754f9066fe6bffa
font_01_sfnt_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 18420 bytes
SHA-256: eed1678601ab9d38b4dc28a8d9645367c349be5829f23e9d156ec4912916be23
font_02_sfnt_off00011b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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