Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f18a71f2576c51…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 06:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9cfd8617d36cc108f4932cb3717165f SHA-1: 76ffa90bce6507857617384a47b1544fe0d8f140 SHA-256: c2f18a71f2576c51d51ad94565366b9f395a144467a28a0bedff1fb50d596cd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to various PDF files hosted on compromised WordPress sites and other domains, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/3517e567bc4c575003d44c353d05878e/zepumigulexetonom.pdf In PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b80751adb8---lalodumatofixujeme.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202108212223194594.pdfIn PDF document text
    • https://olterus.net/contents/files/xiguke.pdfIn PDF document text
    • http://artospace.com/pics/file/79324769715.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/midejepozutepuleroxiziv.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612392d00ea66---miwizix.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609677bc718e7---zugogajit.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/jojazup.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/c104340f123725232046abee6d896945/fexago.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/10317272114.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b046790ce20---zevugurun.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/nulivukixobarozal.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/ce47bd7545b8bac58bf8bb6cf2ddde97/lexedisupuja.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/kstuettrthu6fa004r868ld1u1/fugav.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611562dd72dc3---57066419219.pdfIn PDF document text
    • http://bjjiffy.com/upload/jabilodebasejuvizobe.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d2883567d---97355866350.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/61124861938.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/88781388228.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/225081315.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7e4b7a9a53a07c323a338de3c1247e02/29283122088.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/78a3ff895716e650232807bdd098acd6/52369025364.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/falesexudep.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/mubalekerowiziguronixuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=licence+renewal+grace+periodPDF 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_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 10464 bytes
SHA-256: e0fc14d4e9b93853fb19dff6913a28fc06648537b1027e6537fcc3a174bc5366
font_01_sfnt_off0000f733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 18116 bytes
SHA-256: 4e12cb0fcd213b0029e97e6ee7780e417e4b5d20507e4bc23d6cda9ac790b13c
font_02_sfnt_off000125d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1