Malicious PDF — malware analysis report

Static analysis result for SHA-256 154951eb9a7fbdc8…

MALICIOUS

PDF

81.1 KB Created: 2021-09-11 06:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3cda99371873ecf06839508645d17e60 SHA-1: 0f1daeb5e72b561536b120d99e4ce0f24f9c46bb SHA-256: 154951eb9a7fbdc8d10fe50e87ded9c24ef3728e1d955b8abbcd5dcb9be21907
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://interstudy.net/userfiles/file/mojolel.pdf In PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a39ea4308f---78087133838.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/41202567778.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021921758305902.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7d4776c2d---binapus.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138a2b1b7815---84503081191.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/86831233807.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/63187581888.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/68465605243.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/jefasaxaw.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/ketojusebanav.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/tadaloxumuma.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/61765884652.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/4365641931.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/24338802519.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/vokusatofotefokirubani.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/72007014119.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/66865884475.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/rivewi.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/rogaxivikabej.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/17197928262.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/mamojixudutel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=car+parking+game+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5FD 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_01_sfnt_off0000cbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDC 19936 bytes
SHA-256: 3fe2d6aa86b1f1852a92d2057b74eb680696e8a93f5bd7c91d75fd1f52dee15e
font_02_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001155b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155B 10680 bytes
SHA-256: f5a35c716b0824de747d93626bdf1b6d736153b2414b1f5c1fc940a0941495ab
font_04_sfnt_off00012d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D98 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105

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