Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd92247bd1089dc5…

MALICIOUS

PDF

84.6 KB Created: 2021-07-04 07:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a0b0241bb98f16c71268a8442ea83bef SHA-1: c7eecc371dedf794d82b305b8bf3fee158cb1fd3 SHA-256: cd92247bd1089dc5178610f05c755ce9142da5d1d506312997f4131050b68847
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest this PDF is malicious, likely serving as a phishing lure or a dropper for further malware. The embedded URLs are the primary indicators of compromise, leading to other potentially malicious PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160719b1e7fcd2---diwadirixuterosibakawu.pdf In PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160adf652304fa---42438904735.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/33476823733.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/rikuwavo.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/ribiw.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/0fe0709a026863faf3adbd758550e461/bedaneri.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/140bcb8fdf9864ccce9bbe85598a012b/pofumafaxom.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/xalabomeziregepog.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/fefa1e211d758fd4821503feaae7bc34/23318428679.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160785a6bd967f---94245896242.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-12/20210512005311710953.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/pd0nc4rfv3158umb6edc24pt29/ralujin.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6ad5a1ad0ff56dc83dfd8202eda9eaaa/48882789077.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/73695850674.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083be211f8e4---pulafikisu.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/birepelazipupedawexado.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9c948af2b---8922007573.pdfIn PDF document text
    • http://unsersohn.ch/images/file/perokefo.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/78cd7173fcc0888b826389897173326d/gileba.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088912f53b3f---lonisaserowe.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/zijew.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/80074076912.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/1591308160.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2390983add---19633335917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=seek+the+lord+and+livePDF 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_off0000ea96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 16604 bytes
SHA-256: 4a273b80d6911256f647e6377339f2657780a498dfc470d3f58c769bc72dcca0
font_02_sfnt_off00012dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC9 10408 bytes
SHA-256: 0a427186051a0d02543b0fa54c7be61ba22a7a58badfae9d3f804f01b06c0de6