Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8629b0a79526815…

MALICIOUS

PDF

94.8 KB Created: 2021-07-03 03:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64ef31c8c3a9404bfb19fab9a41fe036 SHA-1: 571c91a2a7ddd750de502f515a3d420e8064345a SHA-256: e8629b0a795268154c36d446dc7b44684304aa3da16772c9bc8cdc7e2e045ed3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites using the Formcraft plugin. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae42a132c15---karenumeji.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079e3fadac1d---tumogijogigupopumileduza.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b46985d60cc---fawetizepukapakawir.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16a2d4c72a---89351526256.pdf
    • https://ceccarbotosani.ro/userfiles/file/18625380074.pdf
    • https://nestuby.com/userfiles/file/nexawefuwajawur.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ced017e22---mosemeloganuku.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/39975384587.pdf
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/fivopuk.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/dba3e36674ab0d912b9e52999269a214/nelevofurejefulatododu.pdf
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/81341687150.pdf
    • http://cuacongtudongbinhduong.com/upload/files/91104680962.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16074a57a35e91---81546487660.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca621d170a---ferepijikagosutune.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087723e0f8d9---81057755537.pdf
    • http://bioident.pl/photos_fck/file/7986583894.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086120768dfc---48436899345.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/906279a6654c240885a28a893103814f/muzuvonuzivoragopaso.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/62d4e44ba7c3a426affe5192479f7de1/38623747390.pdf
    • http://pressvaluation.net/userfiles/file/56271682984.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/97911aed1d063c37f1163c318390029c/nudadukaf.pdf
    • http://savvyais.com/userfiles/file/koxas.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/6478b2a9872735fd28eb0aafc60954de/dujopasiwabepaboke.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=dessert+made+with+soda+crackers
    • 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_off00010cf0.bin
d9995fe79874d5181c812417a42786d03b2d1ca145189acc77442c457373abeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF0 10664 bytes
font_01_sfnt_off00012580.bin
6eb2f130af20bb41b52a56e1537ae12eceb675fb6e1c1b596595ee995bd1023d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12580 18720 bytes
font_02_sfnt_off000155ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155EC 16792 bytes

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