Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1be3911aa8c0fc7…

MALICIOUS

PDF

82.1 KB Created: 2021-09-14 12:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 14e7363adda79a9064248f1e91817181 SHA-1: 8386f0051e494fad5e81f4cfc5a6a1b5313a6a4e SHA-256: c1be3911aa8c0fc7723647d9580d1152ed5530d799989eb0885d77a3a304b257
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://emke.hu/uploads/ckfinder/userfiles/files/gimujajozofawof.pdf In PDF document text
    • http://haiqi-machine.com/d/files/vopanumame.pdfIn PDF document text
    • http://st03.it/userfiles/files/68299814950.pdfIn PDF document text
    • https://cape-electronics.com/media/file/bidonawototudipo.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/fosiwurakubokamabus.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/17822951212.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/50178893646.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/titatavimitawefovetuwome.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ni3so8nmlf6fatqsujrvpi7kn6/38930116334.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/zekavu.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa1f5e77ec---15892766479.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/beriwanojomolezoxuru.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/g58jc1tg7u2peuv2q3t4paerol/28569668835.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/78519664339.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/90330d10e566a47742e804376da77444/rekevim.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132db473d57a---gelifejurilupemotik.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/78624660986.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/mufololiwazoxineka.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/89493213649.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/94135147615.pdfIn PDF document text
    • http://cycling-software.com/files/file/22714262690.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/wubugubusezideguzifa.pdfIn PDF document text
    • https://lorus.rs/files/87468656461.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/77614802955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=elements+of+quantum+mechanics+pdfPDF 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_off0000da5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5E 11012 bytes
SHA-256: 04d8e788b3fa1c77328df2eb9dd529026deeb84f4b58a8314f3da28fc97e1048
font_01_sfnt_off0000f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 18068 bytes
SHA-256: b40e64d77480c2a958fe17e1293fe5cb8739fcba9f610a4dd94d1688a87fd7fd
font_02_sfnt_off0001224e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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