Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf5dcbd2676e3a2…

MALICIOUS

PDF

69.3 KB Created: 2021-09-03 04:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f0e83b88591b715c1cd628aee1ffbc7 SHA-1: bdd615d93bb458e29d7027433a41db08d5f76ff0 SHA-256: adf5dcbd2676e3a213a56848e9e73ed74762fea13a6444d1da23ba88405ed233
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=lap+harp+sheet+music+pdf PDF link annotation
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160838b2d1f220---11104190582.pdfIn PDF document text
    • https://birudongker.com/contents//files/41718703836.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/jc5089928fiamemsdafcd129c2/jikokufitasevinanul.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/gerixo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c465cb2ffae---gikonovuzebug.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/85695151536.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/90768b7f9d7e840b96a30627e00de7b1/tugesolu.pdfIn PDF document text
    • http://iltorg.ru/upload/file/31680293129.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2074d7d58---40771759798.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/nazasagivaremumobimesizi.pdfIn PDF document text
    • http://nemalipics.com/13185824439.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/72650071777.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/figog.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/vilujabeduz.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c749768a812---fofizo.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dd3a6f15e45d052b77bbba244a2f68b8/1831331402.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/zodepemevaki.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/75327014467.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/92fda272b574991ea838ee4b77b4ba79/bedagomorenodofe.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/pvn3hu92pb8finoepsultsivni/kibifitolotijokoni.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606efd03dbbed---vorupelijo.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/86990fc8b9c9f3252c422463b2e64641/55410102933.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/zuzeronosowujex.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e108cbbf59c303a31e2ff665029836e5/pawipifimuwonubopuwovoru.pdfIn PDF document text
    • 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_off0000b349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB349 10672 bytes
SHA-256: 7adb40a75695f94dc43afb49630fa8b3e5c543929413206fd822d489eab378b6
font_01_sfnt_off0000cbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBF 14384 bytes
SHA-256: a1ddf88b5fdb060464024ca5c8df4a3ca27dd9324f9d4e1e94f4ac4f98f2cfb0
font_02_sfnt_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1