Malicious PDF — malware analysis report

Static analysis result for SHA-256 1949fe0d733b2f04…

MALICIOUS

PDF

89.0 KB Created: 2021-09-04 08:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89cd21ba1dd5f43be55a2f745fafa583 SHA-1: cea87c4c13b42075e0336a44e8ddbc367bfca1e0 SHA-256: 1949fe0d733b2f0444e5368c08efefe5dc8274108fd517fb15886c821ceb83ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to potentially compromised or malicious websites. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to facilitate phishing or malware delivery, likely via a spearphishing attachment. No scripts were extracted, limiting the analysis of specific execution chains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/6ab0056a47afb10386c7adf138866e22/vapekuzimafazipebenisovug.pdf In PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///47365700852.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/61684439459.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/dapaveramu.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/niwulopovoweruxetotij.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/ruleneva.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/4327188099.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630175118.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/77723945729.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/e3cb9eed15dfca578dad6fca98c5f5f4/58951556761.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/farej.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/36378c0472279d907f9d3ed8687c9713/rujowuwugoletosaravezeki.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///laximunezo.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/60554729989.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd77698036---momesimoxijinofe.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021080913075773499.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/8760458714.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/sotuxapegorazemitifixox.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c51a5b65790---sukakasivi.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/ee7ab387ffc4d5705dd86dca318d6741/15746231051.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/rujelimisatutakanafiveb.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/pabajelepokijo.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/zedobugududozip.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7cc474c55d---6093019789.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f7501aa317c---ledibimipifuvefobuva.pdfIn PDF document text
    • http://kag.fr/userfiles/file/kabavolado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=metro+map+pdf+in+bangalorePDF 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_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 18200 bytes
SHA-256: c1d9f67ce85dec5a1c3303b5995ffb59e5f5640c2a52e57b3600a60f7d779e3e
font_01_sfnt_off000125e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFA 10804 bytes
SHA-256: 55a9b5c170d2dacf2c6f138b15095af1934c42ea93edb6faee6eacb6c37ec984

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