Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b900dc2f2f8a47…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 04:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b1ddaabe75dd6d999dafa2aaee3532d SHA-1: c8e410e7a04ffbbaf0c65cc713c17334a30a07ff SHA-256: a2b900dc2f2f8a47c9191db3858963d67401f05a809d2df18dd64f3c2d223c4e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the compromised CMS upload link farm heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://prcomponents.com/ckfinder/userfiles/files/32831454304.pdf In PDF document text
    • http://stoewebdesign.no/userfiles/file/lepovox.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/kawabuvokaxalapaf.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/27006219142.pdfIn PDF document text
    • http://thepducphat.com/upload/files/popuro.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/kirewomawu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138ca1629909---ruvejeromaninegozubu.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/77601666406.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/jasowezadovabofafafa.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/86794725592.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/12366746752.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161363bdee3142---rurex.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145a5434cbac---62982972369.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/dosafejunaxejiw.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/44759146840.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/rizulezagejetejoxevitu.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/lerolubabawutaxepipul.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/31260605019.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/7136851631.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/rutowegasurile.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/19717171750.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/debijesidakasez.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614650a07993f---49500533846.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140c84388227---jibore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=assassin%27s+creed+like+games+for+androidPDF 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_off0000dc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC78 17820 bytes
SHA-256: e0ecd5064950802cfd12b689af3693094b0bd47329a39fe2d1fa0b9665dd0e19
font_01_sfnt_off00010a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001229b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229B 10828 bytes
SHA-256: c677f500552c0aa06544e90b805670597bca12405924969bad150a398f6258d9

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