Malicious PDF — malware analysis report

Static analysis result for SHA-256 653eb0fa57e1a2b9…

MALICIOUS

PDF

89.4 KB Created: 2021-06-28 01:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bec0a69f9c9ecda434c48101e2cb4b68 SHA-1: f7a92193a215c30f0c3b35b2a4ddd6ead6957af6 SHA-256: 653eb0fa57e1a2b94d4e4e43b502ad032500da69820f854321119bf88457204f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links suggests these redirects may lead to further malware distribution or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://laborke.ru/uplcv?utm_term=inflation+during+recession PDF link annotation
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160724e39de163---domajisutoviwobevokexa.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/jejofasolivimexikimawomav.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/58m1jpda0fb711dmakolbgbmbj/61524502116.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c495f75ffac---3433765033.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077993021360---pefoxunosegetopefafof.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/6a363670285357569edacfb2f45dd4af/70601197917.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b536ce9a2---zexifuma.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/32622b53c4df10a2e402af86df3562fb/wuvuwova.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/166685aaec6a85e2359823380b21232c/semobifozikegafarunokuxu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9424e0cfd9---41090820247.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a34c9b6cc1b---21746507184.pdfIn PDF document text
    • http://ahchala.com/img/file/84811994086.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/kasibeguwuropowavotuxufuj.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/c05aa70132966b718be69d708adce19f/76653542203.pdfIn PDF document text
    • http://allasclub.com/campannas/file/56133364075.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/gujb6flq6mo8r15ei5d9nues44/mopulanuruxegomoxafu.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/jelajasebosul.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/41558579480.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/rufobazerafuriripoge.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/subumutozejupuxoxafozi.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/22972281534.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/abb8dbd0a2f251cdc8c221fa15141d8e/divowi.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/gudebubemogafujuwazo.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160810fcda89a1---92403999163.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/84600297668.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef9acba07---82599392788.pdfIn PDF document text
    • 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_off0000f931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF931 10700 bytes
SHA-256: 8d787bf5dc87e76b44881f97753c0fdcba953f6cdcdf2ef571a77476a384914d
font_01_sfnt_off000111a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A2 17692 bytes
SHA-256: c5727a0f99336888ff64109002a5f2594c27672041a60f2d3c28c8122241a941
font_02_sfnt_off00014031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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