Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9773c3ff91dce1f…

MALICIOUS

PDF

79.6 KB Created: 2021-08-20 17:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1adb62456fcdb4798bebf37bacd1c403 SHA-1: 87ddf6dbbf33a355b67f3a2e4cd46cda51e536c0 SHA-256: c9773c3ff91dce1f08dacb9fd26f48eaa44675d6241d0cdd2d31667e758c66ed
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to various websites. Several of these URLs are hosted on compromised CMS upload directories or disposable domains, suggesting an attempt to obscure the true destination or leverage potentially malicious infrastructure. The primary goal appears to be redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://avgdesign.com/userfiles/file/tuvefivuxezimokot.pdf In PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/wazofazi.pdfIn PDF document text
    • https://chp-travel.ir/data/file/88306081898.pdfIn PDF document text
    • http://zerosquareonline.com/file/60622855039.pdfIn PDF document text
    • https://comfort8889.com/upload/files/kerumolugiwatebez.pdfIn PDF document text
    • http://elitvorota.ru/f/file/bepulimavawatomof.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/a3dacd77693eded93c94ec7760de9ffb/bapizam.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qf7uhv9nvps8qs3n7ktetaj704/85851957256.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076861f1ea2b---54162001682.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/64982803677.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/12223059898.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/b79f458f8c2c828b41a93ad33ee3db58/79198701427.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/75859209671.pdfIn PDF document text
    • http://svx.su/ffile/file/90686005587.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/268c7297f7e193387c686484e48f06c2/71012021967.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/xulawesotefobuxefib.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070af3b75304---51157060589.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/1d785414ba1683ceec574931a7025c73/27943078204.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/somowivatuzevabozodiriwal.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/8c2eeb329a166cc32ddd87024b1e0891/71873691507.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/931271f7e32dd89b3e34bb8137a2c711/juzugevejuriwopeve.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/87968495613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=introduccion+a+la+microbiologia+tortora+12+edicion+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_off0000cf37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 11156 bytes
SHA-256: 5b728b336f3a2de582634718b19eec781a69e02125a899bdc01a931f82ccd39f
font_02_sfnt_off00010101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10101 17500 bytes
SHA-256: 7e16bcd1454bebda1049eeed07d1f9e851d4ebc998f1d08081e60ef1cf393042

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