Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cc3d2746f98d7f9…

MALICIOUS

PDF

76.8 KB Created: 2021-09-01 05:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9f76c64f01e289c0218c66a579f2ad16 SHA-1: a2d7aa4d19bd62b15bd2a362c60da66c111ba78d SHA-256: 2cc3d2746f98d7f994290ea575020c6c10456c3378c3a371c69f03a8dd64821c
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. The document body is heavily obfuscated and contains no readable text, indicating its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/29ebab99398075f21978511f7a50749c/molelafo.pdf In PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/0c22a9465795283747f29547dff3f58b/xidibidinabi.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607774c0eb50e---samipadedosuxadavopal.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/53478543437.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/kunegixodiwumatakubadi.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/646ff83363b2ccc263c7299e6a6ef357/47416048894.pdfIn PDF document text
    • http://cpviettin.com/upload/files/4250473147.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/15724959528.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/81498360606.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/mopixinesimovinono.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca1626e4c---3657982898.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/fudunabejidixuwa.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc746fa4785---48231062803.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f7e0c376b7151d2ded2424067676e1d8/newuwidiwezozubaboke.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/zunevofusokesepi.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4ec9756999---ziwarax.pdfIn PDF document text
    • http://berbun.com/user_img/file/25423823791.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/g6326mpfu4o96thrpl8ku9qp9e/voloxunanasufobusar.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/wiregu.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/34138497429.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f0f2ef568135d387f72327d39ec1848c/85275897357.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///93848997401.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/37811478700.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e37fc35e0f3dd816b74ec4f14d147582/lajejotarixitofat.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/50418138438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=dungeons+of+the+deepPDF 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_off0000c8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F8 17304 bytes
SHA-256: 8d4dd73f6898854c9aeb40f442cc18934db4fd88ac99ab50d24f3de4cc3d7d89
font_02_sfnt_off00010d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3A 10480 bytes
SHA-256: 8194ee631a5905c8bd255cae452299d621b59b9f48be71ea880a0b554b5e71a7