Malicious PDF — malware analysis report

Static analysis result for SHA-256 6527f93d16092745…

MALICIOUS

PDF

75.2 KB Created: 2021-09-02 10:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 73c7b33968240099edc8c4c91d4b0b82 SHA-1: 4af3c9196a20942ca429ad1d0ec675f4714880f3 SHA-256: 6527f93d160927452812fee231eb61680c0b2f6d8598fdfb5d97c3e2286bec76
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating a pattern of using disposable hosting for link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a6004e42ddd---16134410107.pdf In PDF document text
    • http://taxicityplus.ru/userfiles/file/23388252132.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104f6f0b639b---latesoz.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bad2ee100---77329276931.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/11783922746.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/javepumeledawozip.pdfIn PDF document text
    • http://freeski.hu/freeski/file/19889982592.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/bamuretaxuzeneruvomo.pdfIn PDF document text
    • https://pindimana.in/uploads/file/ribaximijirep.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/milun.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/93c84852743c4ce5a6a0d46b2d56d4b7/81380293834.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7108ca035---69484081534.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/bifatiravewofaned.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a5e4c111f---xidomasajibarigimifelames.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/40756044946.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608487792a907---89210498243.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/9pulnmvipiskmqfkf3f079g551/vulizakurediloditokad.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/dajusuxulotof.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/kqpg4k6miaeisa8qv6tk9h32at/38216294125.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/bd639dc084e88ff142ffb1e51f5ee8f2/botezi.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/39741183445.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/68858060091.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607182d8b4fd0---1998475308.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d8d96946a---melumalezibelajowemowam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=power+rule+integral+calculusPDF 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_off0000bfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBC 10592 bytes
SHA-256: d3567a73745e1e976bf8f9529c5b98b74fa2b29cdd9acf2bbf3a53a44fff38ab
font_01_sfnt_off0000d821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD821 18064 bytes
SHA-256: e8da4f0d3c01fde819123d98088d96a0c441a066ca545fc36e74a49e94c57046
font_02_sfnt_off00010792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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