Malicious PDF — malware analysis report

Static analysis result for SHA-256 902f04e8d94dc4e4…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 13:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8982423968924ccce6616c3505d20496 SHA-1: 1554f333dfd51815299f7a35cb778b16ccc38f3e SHA-256: 902f04e8d94dc4e4f283211a878ed91fbcf6e9ac5f73df851bf63efc07b68117
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting domains. The embedded URLs and the PDF structure suggest an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://factblogs.com/uploaded_files/userfiles/files/nelujafap.pdf In PDF document text
    • http://szolnokepul.hu/userfiles/file/moluwopaseretud.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/74898677887.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/lolaku.pdfIn PDF document text
    • http://djpress.pl/Image/files/zewobabirilesawi.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/48068644521.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/talesojitidosop.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7c2d660de55f72c8feb5d901bc7354d4/37765440585.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54642630465.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/57541139077.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/nisofovadunuxefek.pdfIn PDF document text
    • http://runhouchem.com/upload/files/viwarogegebivixufa.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/eddb3565d05c27700a1c095b9d254a2b/salawexebevuvajofi.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/pifixegij.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///dumemer.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/20978503245.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/fivixosijomubodu.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ddf264a08---kufobobirurobotafozonakuz.pdfIn PDF document text
    • http://herve-coiffure.ci/files/relulido.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614141f371173---72681073303.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/bijine.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/71479402794.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090111255251.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140ef7497728---44855435764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=calligraphy+practice+worksheets+pdfPDF link annotation
    • 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_off0000e111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE111 18252 bytes
SHA-256: 6eb2ddde00b71329264aaa75d0e9a130df417f38d8054136b7f62d87c077f1d2
font_01_sfnt_off000110c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D8 11120 bytes
SHA-256: 9f6ed0e569db3a374e95ee01dcd22a8d2aed634d703b0be1206233145a9be302

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