Malicious PDF — malware analysis report

Static analysis result for SHA-256 3299c7823ff43e5a…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 20:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f561bc68a87e183afbecdfb13a6e2336 SHA-1: ecf2a4e1804fd3eb3e957dc5ca2708e6e52a5461 SHA-256: 3299c7823ff43e5a62467a4bf3a8f063e78023b3147dcd2681320e7194eb7b4b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to sites that appear to be part of a link farm, with some hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or directing users to malicious content. The file's structure and URL patterns are consistent with a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://wastran.ru/uplcv?utm_term=train+to+busan+2016+watch+online+free PDF link annotation
    • https://crownprolaw.com/userfiles/Proj_Name/files/58259303719.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/gadako.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/petovefisovojosug.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/gatakuzijebifubopag.pdfIn PDF document text
    • https://alertsecurity.in/ckfinder/userfiles/files/sigovibamutimafojimevuza.pdfIn PDF document text
    • http://snft.ro/media/file/15740302025.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/tizibibijugumogawinepa.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309554b2c6f---88296357972.pdfIn PDF document text
    • https://yakin-surewin.com/media/file/komexanakumukit.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/kafexawasamuboxisiguses.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130088bbf297---76908353916.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/19297572175.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/44135584370.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/93638702602.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/pedilebevikagigisenu.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/37817430683.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/54791599973.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/xiditovolukox.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/7c25541b2630c115e09d8fabab4702aa/sawuxarepaviwogem.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/35845289157.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/2645729051.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/47620798546.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/90779646392.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/nabora.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/1430253569.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://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_off0000b2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E4 11184 bytes
SHA-256: 3707d6ff6432d63b0a9496397ed990b1fb2e00b7f3f5a196a68a189cb268effb
font_01_sfnt_off0000cd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 14668 bytes
SHA-256: 5ac4116929b42568be8ee0d83733352d079a257246148c644c23503d8b4a9079