Malicious PDF — malware analysis report

Static analysis result for SHA-256 a14748c7fc76e3c0…

MALICIOUS

PDF

93.0 KB Created: 2021-09-13 00:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e31183af80f23b6033f91cea13e9f114 SHA-1: 7ebc5a73dbdc56dbe1de74b3f116c45b298d3d1e SHA-256: a14748c7fc76e3c0b62fabe4e7352b70b769eeb7b0891a07e1c51ba25ea81085
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive and provides a password, a common tactic to bypass gateway scanning. ClamAV also detected this file as a 'Pdf.Phishing.Trojan'. No scripts were extracted, but the presence of multiple URLs and the heuristic firings strongly suggest a malicious intent to trick the user into downloading a password-protected payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://salwex.hu/file/52792793464.pdf In PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161378549af85c---loduz.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/10347493118.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a7b26da5ee5524f3fa199da4b5708645/pudaf.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4a294e526---dirifasidotedujabi.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/1206153867.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/67739039510.pdfIn PDF document text
    • http://byecook.com/ckupload/files/55229838013.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/kapefuxodurifunure.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/mesemij.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/21561049679.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/46415405025.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b03f484e5a---dojurowet.pdfIn PDF document text
    • https://songhongresort.com/img/files/zobevebufigabunebalunuxa.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/gikibisi.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210912/files/20210912224420.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/19100976465.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/mafimajogubixevovin.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/21771505973.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/xupobaveli.pdfIn PDF document text
    • https://blokhol.com/upload/files/fidevikidijuruze.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/56143143494.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161304cc2e0f12---pukiwexopiw.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/kanojo.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3d20b5889---46187581571.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1ba15bb6f---2024788963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pdf+reader+with+dictionary+for+androidPDF 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_off0000f9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 10560 bytes
SHA-256: e8b1ef23634bfaa5795e6c22a1ddce7cf65c9dca20cd048153e60299f8da0075
font_01_sfnt_off000111d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D6 23060 bytes
SHA-256: 05bdd65aee12f73098efa47a6cde80d607b009d41e6d971398d873e1ddc8bc94
font_02_sfnt_off00014e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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