Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c22e84a3ad939c4…

MALICIOUS

PDF

79.8 KB Created: 2021-09-05 20:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c199aec46bc5af25ea08e6da3c04f82f SHA-1: 3b1dd68a498645077907319e9d391844f91ef786 SHA-256: 8c22e84a3ad939c438f45a96ec7c1d452b6fecec10ebe01745e529a1a65e340d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to domains that appear to be compromised or disposable, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious, suggesting a phishing or malicious redirection attempt. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://svazekobciorlice.cz/userfiles/file/gogajino.pdf In PDF document text
    • https://cartolmania.it/file/sutav.pdfIn PDF document text
    • https://airshow-bg.com/file/7789794176.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/90143092451.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/bukerajonegoma.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/43721346444.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/rujebuwoxa.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/14560097403.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/93402850178.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a4e68f80dddfe6e688e00adfea26fd7b/35933459515.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0baa91dd4f---wuperajupivekin.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d31fa1969---nubunasesezivijos.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c248167b6---5127712869.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/tijuwapejopi.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609eab89830d3---80839938969.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/j3kkkree9sd13qktckgstda99q/78175234715.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/wezagajimuguja.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/kepikuvezim.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/87491093469.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b0c477fa31d32154a2bcdc303ae524f0/dozuvovovanokifobewofod.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c0ba2eace---kulozal.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf18226e63---xizux.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/54670025333.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/35787290364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=wheatstone+bridge+circuit+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_off0000d16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97F 17892 bytes
SHA-256: 000ac914499693a1de660b79c353bdaae10ef4e33e6a6d4a8ccb13c80260b909
font_02_sfnt_off000117f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F4 11084 bytes
SHA-256: 795362e7098219a3c1f954c10c54c93a1a8c97d7c9fa19c26d19ce100d9f1424

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