Malicious PDF — malware analysis report

Static analysis result for SHA-256 20764e76c4db1d36…

MALICIOUS

PDF

134.8 KB Created: 2021-09-06 17:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 780ddb66a9bb276d4b84e754134cb56d SHA-1: 67cc06cd3b807830af106ebbe5792c611e338a53 SHA-256: 20764e76c4db1d3616cb8565bed01b70f0055e0f5238be0489adf69dc91006ae
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the nature of the link farm and the detection indicate an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074fd21d50ef---77576956994.pdf In PDF document text
    • https://tanthuantelecom.com/upload/fck/file/nebufuzuxego.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4895e2665---pinuz.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/lo820v3gcdv6m1aql98di4os72/76113572175.pdfIn PDF document text
    • http://partnercable.hu/files/muwosi.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c0af5f722---zigupalinap.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/c37f1b8d6651867ce58efc950fb317eb/49179213912.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/kukogimevosavetowew.pdfIn PDF document text
    • http://cloverdiamond.com/file/kebotomeme.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/xupexozujiwinebavozojik.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af6cee15191---64496049366.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078335359230---bupijifaji.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/kigikanetamutabetan.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311fc0eac98---razubak.pdfIn PDF document text
    • http://web68s.com/upload/files/gilopamogexasukaviwiwu.pdfIn PDF document text
    • https://apizf.org/public/file/kiloxigufetojowobin.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/18174624596.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b84e6dc486c---440333122.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/lumiwinadev.pdfIn PDF document text
    • http://cosyromania.com/media/file/mejiridugefemaxutu.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/27744563622.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/jigigapofumuwoxegijomejel.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/0e6472rqigvedl3008li02oral/sudozalafuvixizogozax.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/jlo84q4e46akvkg0nk5feo95n1/digelagupipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=manual+mdsolids+espa%C3%B1ol+pdfPDF 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_off0001a2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001bb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB03 10760 bytes
SHA-256: 91f776b253e5381f3487b99e4171e26f9246f0d7b8bcef8c9ad3d2125798077e
font_02_sfnt_off0001d368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D368 21536 bytes
SHA-256: 2cfb50d5d5b293d73b51f876424b9e82b6d317864cfbab7fbca16df2e4d90103

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