Malicious PDF — malware analysis report

Static analysis result for SHA-256 b478a3b7b95005b2…

MALICIOUS

PDF

69.0 KB Created: 2021-09-30 21:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe0b0c0637f8338d35d46b18b2d72f86 SHA-1: 04243bd70f8bff7db5f62f46341e58eff195a926 SHA-256: b478a3b7b95005b291f7c78b57232fd42739eda0210ba924fa0bc9e63a42ac25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. Although no scripts were explicitly extracted, the PDF structure and URL analysis suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://mt-creativestudio.com/ckfinder/userfiles/files/63899861809.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2d9017977---sorupivoguti.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/md59a19003904rpuj33ce8ul7c/99747613580.pdf
    • https://abcoegypt.com/userfiles/files/95066551856.pdf
    • http://grandfiltr.com/files/file/29030912812.pdf
    • http://kite-surf.sk/files/33487139225.pdf
    • http://gift-founder.com/archive/upload/files/71286094919.pdf
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/ditipor.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16136d57f92227---38595784929.pdf
    • https://citytrafik.nu/images/file/9122972006.pdf
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/8194526248.pdf
    • http://neo-net.info/giganet/files/file/wurevafiwidusijigofiruxuf.pdf
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/lupixexulufosijos.pdf
    • https://n-v-v.dk/userfiles/file/xitetekugalebodetataku.pdf
    • https://vanphongphampmc.com/upload/files/16494705986.pdf
    • https://shellserva.nl/docs/Image/file/favododo.pdf
    • https://commonlawhouse.in/userfiles/file/48019032731.pdf
    • http://soldearenales.com/galeria/files/31666472763.pdf
    • http://koala-al.com/d/files/35087019770.pdf
    • http://autokaryszczecin.pl/userfiles/file/muzilaxodonugudonez.pdf
    • https://7mark3t2-7aya.com/contents/files/sokidagox.pdf
    • https://urbanshapes.in/userfiles/file/81280113140.pdf
    • http://klm-co.ru/foto/ck/files/lajixemajinedex.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=a+court+of+silver+flame+read+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b01d.bin
cc458ad644782698bd918321432c7585362a46a9a295e6347fa8ade35c065fd9
pdf-font-stream PDF embedded font (sfnt) at offset 0xB01D 10784 bytes
font_01_sfnt_off0000c8fc.bin
62e2c715aa5d18ea201e83e6b8f7a1f4a4e25f9a237d9f558491d842dfb87535
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FC 14876 bytes
font_02_sfnt_off0000ee3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3F 16792 bytes