Malicious PDF — malware analysis report

Static analysis result for SHA-256 4671f2bf89b5b6e6…

MALICIOUS

PDF

84.9 KB Created: 2021-09-02 04:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf700eda9236d6aea17272cb5afc2827 SHA-1: 9d77992731a874b871d0273665bf5b80a91c302c SHA-256: 4671f2bf89b5b6e666f8ffb439e64ac217bf7b7bf93056a3873800d9f98ea874
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://antansconstructions.com/ckfinder/userfiles/files/zugoz.pdf In PDF document text
    • http://prosquash.by/data/52870269205.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/ragagejes.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/9b0028578fad6ab7f2706949435d907a/33587744111.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/p3jq96qjm80h20d70ljti48m97/19049642277.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa1cd75c76---47116309908.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/e7f0f373209170f1351be80575781686/tofuduruxupipabexiziro.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16084d31730684---bodos.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/kefaxinivetamig.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/b56f4321ee254c7d260d5d9f91c386dc/koxiganumugisewik.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/wuzegesapopusorezipu.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/ridenogaxopukejemipiseg.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/7996013909.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/88936921551.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/25fe0151e4bbc070f5d88ff73d41693d/85216649359.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/javaku.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/gusidogisug.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a18a16b3---duxemoten.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210514212908163.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/pofesufaritumu.pdfIn PDF document text
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/jesikusenorabevuxudeb.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/bemabif.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/61065568331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+the+plural+form+of+youPDF 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_off0000e147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE147 19296 bytes
SHA-256: 433795660c87f46e9c276a969b8607a6cc5ff058bc70e10a5b8e991396c03d51
font_01_sfnt_off000113de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DE 10724 bytes
SHA-256: ba20a531cff71a95da0105dd492453e3c2397c0008b4dc202cf533f8481d2059
font_02_sfnt_off00012c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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