Malicious PDF — malware analysis report

Static analysis result for SHA-256 3beb341b622aab39…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 11:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 807212ca9eedb93e591c22946cf8d1cd SHA-1: 44022d9f0bff0e400e71595c5ac41457f66ca3b4 SHA-256: 3beb341b622aab392230bbe9881d47bcd003902b2bc844e3f7747310e45f7076
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://knowleangling.co.uk/ckfinder/userfiles/files/rubimunafab.pdf In PDF document text
    • http://wedding-box100.com/uploads/files/202109091052318800.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ab10ca8adba0c85492b25ba2f8db42e9/xuzik.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161310130af108---mupufifunabidofeguwedo.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/pilebinegawinitafu.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/25022345380.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b7a33f5e0505902a3d9d0ea4fbdaa40a/nagorarutololuw.pdfIn PDF document text
    • http://kasargod.net/uploads/file/sutolusa.pdfIn PDF document text
    • http://weingut-suppan.at/files/8384553999.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/86018683409.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/39809253225.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/kinutujaxevezumobub.pdfIn PDF document text
    • https://vitanov.rs/files/zetasiku.pdfIn PDF document text
    • https://hgb.se/filer/file/vowasosigevudupa.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/31593554863.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210910111004.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab043b045c---joxizatupalapata.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/dexumam.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/52936514130.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e82d2e7d86---sovonogenozaguveken.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/zogewex.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/93791866956.pdfIn PDF document text
    • http://p-energo.ru/content/file/dasamitujolebikopofowog.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/61794174823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=redmi+note+9+service+centerPDF 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_off0000d9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A7 10600 bytes
SHA-256: d351b856720b51bbfbaad31873a75ea90ba231f2c0eda50de70f055a437f88df
font_01_sfnt_off0000f1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 18184 bytes
SHA-256: 0156e167f9c549f7e524b3e972316165d9b3853a0635d865d4ae719ac9df60a3
font_02_sfnt_off000120d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1