Malicious PDF — malware analysis report

Static analysis result for SHA-256 0538680bd24bee8b…

MALICIOUS

PDF

108.5 KB Created: 2021-08-30 14:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4940bcb31c317797bfd7615d9cbfdc07 SHA-1: f7beee71cf5029ab060d49cf4e67633b6a2021a0 SHA-256: 0538680bd24bee8bf26ecebac4e3a699299474e0db3b68eb7dfb8e6c4768a426
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external resources, several of which are hosted on potentially compromised WordPress sites. The presence of a 'download button' heuristic suggests a lure to entice users to click these links, which likely lead to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/4bimc3331v6o8ld98ec9i2q851/gidupegupumofopibaluli.pdf In PDF document text
    • http://studioego.cz/userfiles/file/54158671486.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/45807901473.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1129983786092714f7531f.pdfIn PDF document text
    • http://kunbot.com/upload/files/fenapu.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/28581021870.pdfIn PDF document text
    • https://ikima.fr/uploads/file/73909817365.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/43a00ce96f73678eaab154b2f4dc4304/wozon.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/jelad.pdfIn PDF document text
    • http://makaroma.fr/upload/file/fojufa.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cb165cd62---84222041657.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/rufatudifovite.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/gufadufewotajurepukawixu.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/basikisebebibunixixopibib.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/tituvin.pdfIn PDF document text
    • https://primer-spb.ru/files/files/zuxitapevex.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/8i5tdosq11artkkq98l07ov125/luzoxenaboreb.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/poboregokelizedosurigiga.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210828_8F987E44C8EDF401.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/70463038822.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7t7bd54gflbvohbltclv61rak1/12852690748.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202108091004037908.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/84883199739.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/piparisetoxojemage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=information+technology+auditing+and+assurance+james+hall+pdf+free+downloadPDF 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_off000140e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E3 18072 bytes
SHA-256: 7f43b8032110469c0537c7dc78f9c4e5dc6dc41ae6aee7f5485daf1419c4baf4
font_01_sfnt_off00016f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001879d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1879D 11448 bytes
SHA-256: 43e1c6543a1b69ed7520e81781397cb86a221d43c4678db63752039b1c5d3313

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