Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d60ae4fa87d59f7…

MALICIOUS

PDF

79.0 KB Created: 2021-09-19 09:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c234caaa84a53edbf4c5431e2dec5233 SHA-1: 6a05d44f7ec85ca0f8cf03a6d4d2681bfab38554 SHA-256: 2d60ae4fa87d59f7747ee3652c3f5f2e5490e5b7a9e01d2b00516fa7bafd7420
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or domains associated with link farms and potential phishing lures. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The presence of external URI links, particularly those with 'utm_term' parameters suggesting tracking, further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7976

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://philabc.ru/uplcv?utm_term=thoptv+application+download PDF link annotation
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613676d2f41ef---39805164619.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/55287190373.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/nufomepurevapedopime.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210911112225.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/gm45s1f1op3nh0a7fmncaoqjd7/baxenewiv.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/72449119751.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/66587078552.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1a4345a64---9733602404.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142693d1d5d5---14597189164.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140ee457e3ae---someb.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/62067524663.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109140106233478.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b9af06c6e318896377da62cf55d407d8/85298682320.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/kinavidumag.pdfIn PDF document text
    • http://saydersan.com/firma/files/84684309458.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/21502261722.pdfIn PDF document text
    • http://esistore.com/userfiles/file/20075698167.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/6c4c475c0fd58772984434f7bc46c364/92488017194.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/kupade.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/81122423771.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c5a727635---varezini.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/57017980948.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/11520714399.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/2851337890.pdfIn 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_off0000d899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 17932 bytes
SHA-256: 3884e101ad547b03b27faf25bed1ab93ee6ba02f9c733b0a4e6c5a330349bb1a
font_02_sfnt_off00011f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F56 10324 bytes
SHA-256: 42a589d4d1249da4cb621a5e68a4579584ba9409f04d81c1d2880062361d6e11