Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de0d1f748fbc13f…

MALICIOUS

PDF

106.1 KB Created: 2021-06-26 04:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c45ae08333f9950c4f3d83e0213641c SHA-1: e23988712e1aa79f375562298ecfd7f9ad3e1050 SHA-256: 8de0d1f748fbc13ff581419f25f457158b7a9106c8de878275a95da8c7a73c0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are consistent with a link farm used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://affordans.com/ckfinder/userfiles/files/95260517881.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/41c3f9d6ebf5c0294aed34e1bef372a2/lotosibalodagikewaruluv.pdf
    • http://kingalbertltd.com/uploadedfiles/file/dixijonokobidedizowaxoda.pdf
    • http://tunglamgarden.com/images/fck/file/ronixamamizuzopopivar.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea8907634b---7626253373.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e26c608993---455992512.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/dbb374e41ae6af39aa7d6248bc92347b/76048161602.pdf
    • http://zae.me/datafiles/file/30027969643.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/1657287123.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-5-25/20210525185120283619.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/7c019ce652b4f06b6009ff16a84c364f/48248692649.pdf
    • http://anandamsanyal.com/userfiles/file/dikiloxarasiwulipikekok.pdf
    • http://optykglowacki.pl/obrazki/files/sifamaxom.pdf
    • http://campingwithconvenience.com/files/files/13120950170.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16082fccd8b33c---7176458586.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3c3a0f78080d65e34253788c95c47042/10600007965.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/16290d7ee353648313acbc11beac6f14/97118475841.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609486e2461fe---fukoxakezabaxabezaf.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080754e6e065---luvoteniveja.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a955c64d86b---5869098932.pdf
    • https://bikeid.net/ckfinder/userfiles/files/xipatupeloragamafetome.pdf
    • http://mosjob.ru/images/file/garivomafe.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/4a21e7c9e54316fe10d3c705e658be7b/54533583748.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad49ef02b8---35053873457.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/utsckn0uj7nob4kcvmt1bp0o1o/zufajozixerof.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+bedknobs+and+broomsticks
    • 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_off00013a59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A59 16792 bytes
font_01_sfnt_off0001526b.bin
ed0f9e7067196b6ddd83c27856da87ed2347d5cb1b9a638262af3ecea3c03437
pdf-font-stream PDF embedded font (sfnt) at offset 0x1526B 17664 bytes
font_02_sfnt_off000180bc.bin
269e1274175465e326a872776517a36d67d9b73bf8c91bffce8539adfa142914
pdf-font-stream PDF embedded font (sfnt) at offset 0x180BC 10784 bytes