Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc7964b5890ce60e…

MALICIOUS

PDF

71.3 KB Created: 2021-09-06 08:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a6429d03f551a94b25e9b8802f43dba6 SHA-1: 035016c4dc7773ba93027d646ff85c92095486d4 SHA-256: dc7964b5890ce60ec00c0bd436b238dad2860b499e9039fb643c62508c5eef3d
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, specifically within form upload plugin directories. These links likely serve as a link farm to obscure the ultimate destination and potentially deliver a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607733e42e8a0---11781428269.pdf In PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5686927e7---xujetelunevad.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/55520817468.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/xepetedepeka.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/vufapovovijejubano.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/telidivi.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/072e20b42b91b1f2af2cb5d9035f9117/99381844588.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/57054158000.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/42c865f60a6339c64071a7d3e9028caa/benezabip.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/dsitmv7uda4a9v27d569432jai/rolodimolela.pdfIn PDF document text
    • https://kawanmto.net/contents//files/27375383430.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/45142534846.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/70403907004.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090fe4e2b100---35943459773.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/64680552922.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/413072f3cbd1d55ea29b482e9c5fc137/letapi.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/fewotaxebewawonikokos.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b39e8a03437---nuworomomoz.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/dfd0c0a54a878f7ae67d5f5a6a2ac2bc/12277528251.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3aa0fd480f---torajegewisuwipi.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/6rrssuac1t4trgrdmc3t8nu8q7/81562668719.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084be4f6b13d---36288073140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=nando%27s+mauritius+menu+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_off0000b46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46E 15968 bytes
SHA-256: 9cb604ebbc21e0995c6f95e5a4161e662ede70d2ad72fbbe5397aaefd14dce66
font_01_sfnt_off0000dd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58A 10724 bytes
SHA-256: 61fe1e05ac9a3207ad455dbe4d609f7ba28ce283488644a688453c3778096559

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