Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ec1cdd1b33e87c…

MALICIOUS

PDF

85.7 KB Created: 2021-06-27 11:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6d3004ba1922f7913c3649bf5ce5ebc SHA-1: b477c44fc82f669986517729846d2d6a3c979a50 SHA-256: c6ec1cdd1b33e87c7ae14bf0a08f31f47b5b05c79a823ba82aa4e2c723112fc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, a common tactic for SEO poisoning to lure victims. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm and compromised CMS upload heuristics suggest the PDF itself is a lure to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/392620c2ab4f2c0287d290cf295cfdf3/76265867425.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d36bab19721---29988422599.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46e0d34c7c---60383656376.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/lunexosexitokadokibebut.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/6f48580fc9413f68a724ce815baa82ca/regoziwi.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/a34a483791ed54b7c90e3794da300634/72570592931.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/ce798dc2f0dd03f4341e2e38f85627bf/tiwuzapigejivuvinovi.pdf
    • http://evevoyance.fr/adh/.-/file/63727115142.pdf
    • https://baxsporthorses.nl/userfiles/file/volonapetesiwujete.pdf
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/55830195353.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/ratirazije.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/9de26260186af29ce3c36d04225447a4/41289844897.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ba9eca1ed00f8c33a6273b00e4f7c6bb/84722088071.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/u30logkscrtmo3nigm945hjcd4/mamulepaleredowimanojo.pdf
    • https://local-atlas.ru/userfiles/files/14225723763.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/d0e4942f85de925db12c94c440344eea/zusafojamidimafedapuvef.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f23469b27---wilap.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160799d0a2d8ee---80766646294.pdf
    • https://lemanssrl.it/file/ginipabisavajetun.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9c3cf2f4f7f2e251e55aa2d20812e63a/20637099468.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160819d5837256---40427567842.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/d04dc3e0cccf01d0a722ebe4da9364fb/51042496730.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=a+voice+in+the+wind+pdf+download+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b6.bin
cf637dd4e076c2e99c9b7a9df53c7c5f404781c4a7ca7be071902797d1a15059
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 18000 bytes
font_01_sfnt_off00011917.bin
6fc4da67be69b7713dd802cf06060af8e19aaaa4558d0e21a9cc674292832973
pdf-font-stream PDF embedded font (sfnt) at offset 0x11917 10684 bytes
font_02_sfnt_off00013197.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13197 16792 bytes