Malicious PDF — malware analysis report

Static analysis result for SHA-256 6377332569e06b13…

MALICIOUS

PDF

74.3 KB Created: 2021-09-20 15:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1f6ca3d400aafdf3fdd3a8397a4497f SHA-1: 212da3a4d236275afa17dee9a252b9100e99db7d SHA-256: 6377332569e06b13dd28a0fcd1bbfa2492a8acb0f692fdf2d141a39422cd5c4a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 https://drafthe.ru/uplcv?utm_term=android+seekbar+text PDF link annotation
    • http://westhollywood.ilovepokebar.com/uploads/files/vogalulafus.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/78110205881.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/gozirabobakafirivikemine.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/11269113911.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109161553338650.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/283e2a85c81517fe3de7febfbf077c63/gubetexopipodakedodiv.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/82920284835.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/6918916492.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/bijoroxaz.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614424ad60b6b---99347173770.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/85264781756.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/wozepujilaturutifowu.pdfIn PDF document text
    • http://happy-land.hu/editor_up/vamusetupebulopazidek.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-7/20210907181950735364.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/desobimagumivupako.pdfIn PDF document text
    • https://eventaipei.com/upload/files/8976361348.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/45875787279.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/likagipafaker.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/f6fc1aa4ac25e04e49e1eafff8662955/7879952963.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/bapelubegofakufasilup.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/45973444497.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16133316b9fd03---93446919670.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/kasoxevomumotogu.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/42611249173.pdfIn PDF document text
    • 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_off0000baf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF5 18700 bytes
SHA-256: 5d28fa2f8dfad7d6ded8a93e651d91fc07a5685f413b67d37a380450e06ba731
font_01_sfnt_off0000ebac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C3 10508 bytes
SHA-256: 9622900b4b294ff4d37f19c82047fbd070db346400ffd577d00a3099c77ba183