Malicious PDF — malware analysis report

Static analysis result for SHA-256 56dd5cc8db1253c1…

MALICIOUS

PDF

83.8 KB Created: 2021-09-15 11:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d9ef2c68c74b594ef4ea85f03c84ffa4 SHA-1: 4e6c493dbb77b9df2a71b90357a6b1f19d38758e SHA-256: 56dd5cc8db1253c12105a4b4dee38ccd28fcca98b7d605558c4962829042c71e
216 Risk Score

Malware Insights

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

This PDF document exhibits multiple indicators of malicious activity, including ML classification, ClamAV detection, and heuristics related to link farms and MFA lures. The presence of numerous external URIs, some pointing to compromised CMS uploads, suggests an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the heuristics strongly indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pixomot.ru/uplcv?utm_term=how+to+transfer+files+from+a+phone+to+a+laptop PDF link annotation
    • https://digicpictures.com/downloads/xegumijebamerexezojulix.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/78f8992272f4571773e9a7b05c5a6489/keteluwidojag.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/80784760401.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/42207111221.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/64600640270.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/92391509382.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/83309351098.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/fepazakidowizeginibivuki.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/xiseworadatarixusizo.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/71411132391.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161417223eeec4---43494041895.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/81545391180.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/gamurovuku.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d80eace2---12416984126.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/kexewi.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/suwinolomurojefagolepo.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/bexulowanubuzuke.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/74522509862.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/mufomabuvujofafukajokugel.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/73669519565.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/wazunut.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/sirorud.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/zeveji.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/kajodiruju.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/99142885525.pdfIn PDF document text
    • http://skupka54.ru/upload/m/tizenibofizorosepuxa.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_off0000e317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE317 10700 bytes
SHA-256: 4447abdc8c32373947f8123a7e87af7fb9de1e0e06d71c744065b968f68a0927
font_01_sfnt_off0000fb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11384 17612 bytes
SHA-256: f324aeb779c6ae19da7512b63997edca03873ab69912e26864e7e53c4a3a2106

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