Malicious PDF — malware analysis report

Static analysis result for SHA-256 830e9d4b1135b607…

MALICIOUS

PDF

90.6 KB Created: 2021-08-16 16:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 00232571a47a6a90abbeaa543393c0ed SHA-1: 4d7539d597ce4b40b7ba8782a1fac697f251a6c1 SHA-256: 830e9d4b1135b607387cac34b5367c562e8636d0ba11f42fe576730faf5b8c2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous external URIs pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://philabc.ru/uplcv?utm_term=decode+and+conquer+pdf+github PDF link annotation
    • http://nomorecpapmachine.com/userfiles/files/wujatebubebotaw.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/vofilezivuja.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/35846126223.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/simosimobonifubiv.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080baf6a22af---dosudemoj.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/kebowoxivonalagivemafete.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/7aad61a898511b27a25f03f8ea8117d0/90358472303.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/dokorakosavi.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/penufofila.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a25b7bff2fff1913ed11eb6e89af1948/wopuxeresegi.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c1f17cd28---wituxam.pdfIn PDF document text
    • http://glttek.com/userfiles/file/zufevewatadegow.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e408bcc67---saxamid.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/7eab78fca1a83ed5b00da078db323300/74494525529.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210611100650799556.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/wojodijure.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/cbc102ae3f37c9026b3d6c8660327767/32422918265.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdc8cb66a0---zojutigirep.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4af26a3fe---42592204117.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8873afce0---vekodi.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d1e726f5f---miminibugitowiwelafez.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/nurigujumugetusudumumagam.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/novobiki.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/bd9c164d1abc10850e01513e398845ce/82554674610.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/vusijejoreraxado.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_off0000fc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2F 11072 bytes
SHA-256: 12b035244e401a292d5d97aedcd34d6a3aeb4fd2b516817e2985cd957288b94f
font_01_sfnt_off0001152a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3C 17440 bytes
SHA-256: 4782c34f5d037d15417bb42f97ce14f3e3ebe83316aa6b980dc78522b00eaf8b

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