Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c5307f030b126b…

MALICIOUS

PDF

104.1 KB Created: 2021-06-27 04:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78e7eceb3c04cf96cc01eafe27af902b SHA-1: 59c9e851f2c1648c347bdff10435fb141917a951 SHA-256: 39c5307f030b126b8953f6e0474bc0416bfa95a9563678d8d5b0b8720ffd635f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/5465349396.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd3c04c65c---latuzudekofojulixituf.pdf
    • http://prodottoitalia.eu/userfiles/files/gebosajewabuzukeruvej.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/gijorifolugawi.pdf
    • http://dietmoiquangle.com/webroot/img/files/20135391346.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090f576e3f30---42211801576.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c166a75432---61199877822.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb8c29adda---kovusebudaka.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4a5d96a502472ceef0b52c68f16b5da6/tobikewadabamesekopurej.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/68ba8b9152b1a1b001fbaf2614f30527/jifuk.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acd8ce9c6c---bejolinodenami.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/a653k556emrqn596hmk3ilkovp/fenufobowekotiron.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/47e95e932b1fae4e70c49b3b64c45102/wunizabozox.pdf
    • http://keletunderground.hu/images/uploaded_pics/file/fitikamafejupili.pdf
    • http://allnatureint.com/userfiles/file/zujuwusukikukenefegegexib.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab4a535c22---weguxezururimikoxakarum.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/kabitonikegoraxonikegaf.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/f35814b4050856fad81848724902fc02/mileg.pdf
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/19059e9355f0dbd5ac72870cb99ba788/mubesage.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607987eabc99d---joberufa.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6095fe94d3---44739485938.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/tdq3m6doiak6p344n8s5tol1ba/72046610881.pdf
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/rasogukit.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dec921381d---keziwekir.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=bibliography+for+biology+project
    • 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_off00012ea0.bin
cec48f1aa28ab5f9eb79ab63148fe9c6668258a9f549a697b578a473fe1ea379		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA0 20112 bytes
font_01_sfnt_off000161d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x161D5 16792 bytes
font_02_sfnt_off000179ec.bin
952496dcb166c3d71f028033e44c556abb507ed1940b761443ce18c372a426bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x179EC 10924 bytes

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