Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a0da5b02a25374…

MALICIOUS

PDF

74.4 KB Created: 2021-09-22 09:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 588abcbb6f953b5b92ec76f9d961bc49 SHA-1: d593155d3cf00f927da609b0fb6fbed6f06aacad SHA-256: 58a0da5b02a253746b2e3bc4e63226ad979e9630c5fd5fdaa0165e77abea4de0
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous URLs that form a link farm, with several pointing to compromised CMS upload directories or disposable hosting, indicating a phishing or malware distribution attempt. The PDF structure and embedded URLs suggest it is designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=non+verbal+reasoning+nets+pdf
    • https://dodomacnosti.net/data/file/fofelagudesuw.pdf
    • http://ymmicro.com/files/files/92154800819.pdf
    • http://phuwangnam.com/user_file/file/loterolelakatunilatisagew.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ada5db1a0---9473949021.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614501c355926---90802874158.pdf
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/woxemasarurum.pdf
    • http://an-ocn.ru/ckfinder/userfiles/files/24261680479.pdf
    • http://righetti-ticozzi.it/userfiles/files/51446678465.pdf
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/kikakugus.pdf
    • https://penzion-palice.cz/content/pufeniwala.pdf
    • https://akproauto.com/nbloom/fckuploads/file/wubugolozopopo.pdf
    • http://refah4ter.info/basefile/hotelrefah4terir/files/febolorolaxapilupe.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613897ec270cb---fomapijolexopavetixenon.pdf
    • http://zhfangyuan.com/uploadfiles/files/xasaxamap.pdf
    • http://planet-for-events.de/userfiles/file/vimitumewosadi.pdf
    • http://chono.mn/uploads/userfiles/files/43779736230.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/laxolidaje.pdf
    • http://medicamarsala.it/userfiles/files/31075922261.pdf
    • https://erdemlerkoleji.com/resimler/files/tazevupebobav.pdf
    • http://ks4073.com/file_media/file_image/file/90852710144.pdf
    • http://duet-czluchow.pl/userfiles/file/xuxekogerenedabawevejik.pdf
    • http://burmeseburmilla-allevamento.com/userfiles/files/6048177538.pdf
    • http://wienbildarchiv.com/upload_files/files/41047714117.pdf
    • https://samuelben-horin.com/userfiles/file/siwelusevukevikigo.pdf
    • 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_off0000beaf.bin
5d3418e1a8d3b42210a2afecb1c381b14a3ce8f33b7d2ba3d9f1ac4fee36ffaa
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAF 17216 bytes
font_01_sfnt_off0000eb59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 16792 bytes
font_02_sfnt_off00010370.bin
4307c4879a8e1c542284c9627c073dfddc4af8aea3de1f694601575f0d0bc8b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 10856 bytes