Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b7faf48d09338f…

MALICIOUS

PDF

74.8 KB Created: 2021-09-14 12:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a68719eed85eb1e01510f05b974abe68 SHA-1: afb1ae124d50a3ba00b3283c7abadd13bccadb9b SHA-256: 29b7faf48d09338f7aa671952758151cf661e08e7b5be2ae186b9234100b732d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://goldfieldssanddrags.com.au/ckfinder/userfiles/files/74765515245.pdf In PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/gowexupozukofejaninez.pdfIn PDF document text
    • http://glttek.com/userfiles/file/45346876217.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/10819299398.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e5d4af51e---fufejikupopelupujiloj.pdfIn PDF document text
    • https://nistd.in/userfiles/file/91091726049.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/207039893461317e91611dc.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/xivotikumukakilamobos.pdfIn PDF document text
    • http://koutingchina.com/upload/files/sugegesivoxewom.pdfIn PDF document text
    • http://bulmarconsult.com/files/pamajugojenamuvetapiwagi.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/35243251764.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/34114726612.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/vovelarolixum.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d41b5286ac---vusorukasuse.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/9958054780.pdfIn PDF document text
    • http://domuran.pl/files/file/51925285596.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/sogukofodoboror.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/lakoxedetikeri.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/5686093934.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/73171804765.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf5c118372---miwisezujisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=kamasutra+book+in+kannada+pdfPDF 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_off0000b9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CB 10804 bytes
SHA-256: 415a4fb03016e9c21a6b7d799e0a953f937f4cedf45c2129cf376bb18ea8e20e
font_01_sfnt_off0000d270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD270 20464 bytes
SHA-256: dbe0736c10296ee9cfe6734424f0b62ae5cc581a16f59b934bd3e48e279d0347
font_02_sfnt_off00010604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1