Malicious PDF — malware analysis report

Static analysis result for SHA-256 749f7251011adb9f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 03:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b2d68dc2ef09e0ac5511aeda48e6706 SHA-1: 7558deee56dddbf8a5be484c7d1db6571182fcb0 SHA-256: 749f7251011adb9f06cb92abafd8294c429f6ec42c5ec68dbbf39736d57c15ed
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. One notable URL is https://inwebjor.ru/uplcv?utm_term=gta+vc+graphics+mod+android, which likely serves as a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://inwebjor.ru/uplcv?utm_term=gta+vc+graphics+mod+android
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/vefabapugadokowosuderes.pdf
    • https://martensmgt.com/business_school/uploads/file/xivemebuxidenalidulamer.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3a8701f63---20086192948.pdf
    • http://eiffelflowersquesnel.com/userfiles/file/kebesizivavalubas.pdf
    • http://portalpr-b2b.es/img/user//file/_0631291001630770616.pdf
    • https://nyig.com/files/file/43065243478.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613538867d537---gogelaguzidopopufa.pdf
    • https://angkagenap.com/contents/files/86782726937.pdf
    • http://mutamobilya.com/images_upload/files/88117845391.pdf
    • http://belovosushi.ru/files/ralulavavexedekewopaz.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/46891392680.pdf
    • http://xinxinhouseware.com/uploadfile/files/bologotezuzuwarusoxajo.pdf
    • http://kinel-hunter.ru/upfiles/file/81244095662.pdf
    • http://tydafa.com/dafa/uploadfiles/20210905125647.pdf
    • http://hanasushichoice.com/uploads/files/27560194654.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/9c1debc442528d82971d8b64d881ffa5/96026443203.pdf
    • http://standdominica.org/files/files/14350153501.pdf
    • http://cross-winds.in/upload/contents/images/images/23623751998.pdf
    • http://naturenhuman.com/app/webroot/userfiles/file/5956490838.pdf
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/kivefivurikagupop.pdf
    • http://nktrading.qa/file/files/dimibuxelarezotupunetoto.pdf
    • http://krajinar.cz/soubory/files/nugolo.pdf
    • http://damosushipleasanthill.com/uploads/files/giwofupegufakinivof.pdf
    • https://zivotzaokny.eu/res/file/2868567467.pdf
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/15255606416.pdf
    • 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_off0000d50b.bin
eab0cac6b302f51a81aafe0e52e889e15dd6264f15a7582816444d98530c255f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD50B 18120 bytes
font_01_sfnt_off000103f9.bin
298e1387d2df5bf9c0e6e2760ee8bc192e8e7f0ce261bb7433468994b1272042
pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 10888 bytes
font_02_sfnt_off00011cd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD4 16792 bytes