Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a146f62a45cdc7a…

MALICIOUS

PDF

70.9 KB Created: 2021-09-04 15:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 82594af7f61f542215966c31ef8b50b9 SHA-1: 23b362f359d060b52c3c7d6ff610983382b9cc98 SHA-256: 8a146f62a45cdc7a013fda26b0ce603358b23847fb03c842335185d2bc5b3cde
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The presence of these links and the overall structure suggest an attempt to lure users into downloading further malware or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e9148c7ae31---79991116545.pdf In PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072f8994ee07---10594444380.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/97726187120.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/pixinenijewisamopugim.pdfIn PDF document text
    • http://gibisch.info/files/files/sofuxomi.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4793c25687---zasizidimibob.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f4e8b0c95---18782253875.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609622d9d01e1---dopajumex.pdfIn PDF document text
    • https://datawire.gr/files/files/kefunumowenivodenomi.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/wilenuzomufozejasosaweno.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/lomodonuke.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/8927973808.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b284853a1b7---roxidaxigegawobomir.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bc11aa42c---60438002614.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a275a8508---bebotajomegosariba.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/99840509916.pdfIn PDF document text
    • http://standdominica.org/files/files/jokibokijurojefob.pdfIn PDF document text
    • https://le27.fr/docs/file/34431552192.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/13977835847.pdfIn PDF document text
    • https://ebooksweb.net/files/file/loworolasa.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b78d2997ef---bijejazitabu.pdfIn PDF document text
    • http://kim-clark.ru/files/file/17116754411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=mht+cet+law+2017+question+papers+with+answers+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_off0000b35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6F 15728 bytes
SHA-256: 3b4dfab0d7c35f24eedeaf58169e27d2a3f5299cb85eafb81ac25aa14598e9b0
font_02_sfnt_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 11388 bytes
SHA-256: 857f286a8da1e52fe841aebd1ca71e6601a04d9b4f6a13feaa528fb736b254c5

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