Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc3a64e093e4931…

MALICIOUS

PDF

87.8 KB Created: 2021-06-27 00:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 69ba85251a1f135b0713787e7e82f7fc SHA-1: fab62f02d689ea66aa5efa0af64b534df0de0087 SHA-256: 4fc3a64e093e49313b40dab478bb15df799f6513bbfad66b1dcb4db2fd7cc58a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These links are likely used to redirect users to phishing pages or download further malware. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://queure.ru/uplcv?utm_term=apple+pie+with+premade+pie+crust PDF link annotation
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a61b91a0490fd290da7fa86fd36cf9a/14095151923.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/2pj4sr9teaevv5nm91dno95oil/95093079043.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608119ebca3ce---kezoxakagesokukadif.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/aedcebc336ca8a8bf505b4a4df54bfd1/98955003036.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709d431be6f---75413549556.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609541987fec2---90256987968.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/fc3e08cd128a7018e708ef9885377632/99961717491.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607975b278461---tireneka.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/e64f85f2858de4c5579298f35e6a681c/1745862775.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/zusir.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/8569091941.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/doxerumarawelexedijora.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55c5ad88f2---51479126808.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210528_442C6AD01F6A2252.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d950b406a---22117882876.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947b47ec481---51178683442.pdfIn PDF document text
    • http://maxbrio.kr/files/files/88541480431.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/ditugiwuwubixodis.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/2l64evpcvfabjsejvsg0qiqce7/22614091790.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/xerokuwejedetitakusosi.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c38392bb34---81122069883.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174555e225---vidadavipukelisoweb.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_off0000f412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 17504 bytes
SHA-256: 41df0cbc0abc16a797dae52ce1a3cb3cbddcbea7440b30f9cb70ac713eb72b09
font_01_sfnt_off00012143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12143 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001395a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395A 10720 bytes
SHA-256: 2ef69671ee99c92e6f965fe6a702876a34d3c298e7c187d725dedc325d511348

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