Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6cb6a4edd6464a…

MALICIOUS

PDF

87.2 KB Created: 2021-07-25 09:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 89ccb764db362bf205b9a2bdb1b93ba5 SHA-1: 985571e80e0698f65e9d24725462264a2d0203fe SHA-256: 1d6cb6a4edd6464a6fd12fcc657c01a79d0e2135c21690b189ce7268a379151a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The primary attack pattern involves using a link farm to obscure the ultimate destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cuisinescartier.ca/upload/editor/file/84667588623.pdf In PDF document text
    • https://svltv.in/userfiles/files/nutakuwo.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd3b80c8d0---23796371108.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3263d7b975---temapubevupe.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/40082414526.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/71729015050.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/1b45434ee0c4a91b340e66ad275a130a/77117133014.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/pomibixeburobivapaluf.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/gidipebutux.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a055b54e43---92165328512.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/53905745008.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/19345984752.pdfIn PDF document text
    • https://lepjunk12.hu/uploads/files/30249431337.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/54112539199.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/nezelu.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/54088214245.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7329e503a---53475607585.pdfIn PDF document text
    • http://atek-ent.com/upload/file/35387855489.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5620d3ec2---talofopemojuvujifisur.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/podejatez.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af7297fd9d---81870110452.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/39445250443.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080c78b03caa---1798455850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=bokutachi+ga+yarimashita+drama+ep+1+eng+subPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE231 17140 bytes
SHA-256: bb511efc52d7e942d146e61954bcb74414793d6c5c7517de7575289cd884f97b
font_01_sfnt_off00010ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 2828 bytes
SHA-256: 96510c7ce153e6bacf586bfeede57c74c1c00527139a64879f81f2c3cd42f84c
font_02_sfnt_off00011ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000132df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DF 11468 bytes
SHA-256: f8b116d62cd0cb30c506f2e9ac9c4add19a4d62928bd2d29f235c2db760e5198

Open this report in the interactive analyzer, or submit your own file for analysis.