Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fdc2b2d655ad3ee…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 22:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7b3f07b261f0546dcf8e421df3b6335b SHA-1: 1d69ae21c6e1e788ec92be3f5059579e25e96d64 SHA-256: 3fdc2b2d655ad3ee51091731fb108671ab7e8b1099245b7dbd5ef2e71aab9ece
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are consistent with a malicious document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/kvp1eg569mf1h9gaicsevl5jr3/jewufamukekitawoxis.pdf In PDF document text
    • http://actinq.nl/upload/file/gamaxoxaragafufamasoraget.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/nusufiwufinofineridujevut.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/5cf03166c7c1d315181aa5fe5d5f30cd/6083466166.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/wuxizuxorakofupurule.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/fovoneranigigot.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/9275702529.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/1650bacf1b00d50db5c2c45ba7ef6d24/64198617848.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/34993536822.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/79680097441.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/wibenokipusenukorijawos.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/zoboxagujijufuzudimixut.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/dutamamezosiwapujiwaku.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/8929721375.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/10de6c536a384973363411199d4833b3/jenirokasilufe.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210917_216F140167A8C4F7.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/88181413490.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613932658063b---gatuwibalirerux.pdfIn PDF document text
    • http://ruihuitax.com/files/file/39945879946.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138bf4fcf1bc---saxokuvivizaxunabunijibux.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/b104469684b56dbc35a64632441e7464/54719611127.pdfIn PDF document text
    • http://premo.at/userfiles/file/jararonivasolugojod.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/31489104218.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/felop.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/36427960810.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/89416150461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=among+us+apk+onlinePDF 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_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 18056 bytes
SHA-256: fefb19832f833e18f1f48ac8ac665694c3db69e6b2a82e91e229777494ab7bcb
font_01_sfnt_off000112b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B7 10568 bytes
SHA-256: 79b5b5b82b5eda5b88463a0834c7fb7a5b13d22c41876b998a9f7a8e22b3eec9
font_02_sfnt_off00012ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1