Malicious PDF — malware analysis report

Static analysis result for SHA-256 cccde6b7ca844522…

MALICIOUS

PDF

77.1 KB Created: 2021-09-08 20:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: acc6680b8d69cd6baee0d9aea5bd83cf SHA-1: df1712ad72b61ab463ef7991268fb78422a73c5e SHA-256: cccde6b7ca84452230ba9d1d1e7f9282d05a118062a3cc26d42dd71bf07614d2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to potentially compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://ahkkpcm.org/userfiles/79789328544.pdf In PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/41f7c58f82f3c8d2cb1b2cfc4e2fa9d1/85267842225.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/55518548801.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/tebodoliboxepavurate.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d3a6e4f08---54170129868.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/42973514747.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/54955463613.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210908231704_rh2gdb.pdfIn PDF document text
    • http://dentali.cz/files/files/87016844398.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/puwixomanedafanak.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/53827791845.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613304262f1b4---37016349015.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/36721556904.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/45533457570.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630832580.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/pipigesesimakijojoxolu.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/98272559386.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/65975697330.pdfIn PDF document text
    • http://shesob.com/file/files/38844791543.pdfIn PDF document text
    • http://ibshospitals.com/userfiles/file/40664184711.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/funoxiwenejam.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/falitab.pdfIn PDF document text
    • https://egf.tw/test2/images/file/1229944943.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/zuburojigomeke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pdf+to+powerpoint+acrobatPDF 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_off0000c72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72C 10628 bytes
SHA-256: 7a49eb84f3c620eafc1cfbed8a2053440a44d0b1f123b6be834409b7ab444896
font_01_sfnt_off0000df70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 18700 bytes
SHA-256: 523339df5d527bdab39012068b33b05f59be5951d552f4f135731c5926472457

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