Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8047569f58ea611…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 04:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7d07002d2a4fcd43fbdf8ac71ddfe244 SHA-1: 8db9833bda1ef73642055319565c0440811b2c9b SHA-256: d8047569f58ea611b8d3d38d0706fc714abb820ca996508a980b54e8b1f808a9
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The PDF structure and embedded links suggest it is designed to redirect users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9854

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drentmedischadvies.nl/uploads/files/gokumivapex.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03dab118c---zagilinumi.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/68511093048.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/vezizedemiwosul.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/40787681660.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/e8f0b0f3a9817ed84331f492f7e9d724/82288323542.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/42859870493.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/peretokejagalej.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/xiwepawizopadigogulipipa.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219111529208870.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/vofubazuloxasuvaliruroke.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba5717517---noziravedelobodamebix.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/dotejal.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/52470299127.pdfIn PDF document text
    • http://cozyboutiquecruise.com/upload/fck/file/245951205.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/88701669501.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/dewasipimalopa.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613847adaf12f---36043322410.pdfIn PDF document text
    • https://proxus.nl/file/92062399570.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/rebatu.pdfIn PDF document text
    • https://duel.pl/userfiles/file/vesusamozurone.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/wusapavisotenasuri.pdfIn PDF document text
    • https://questyme.com/userfiles/file/68129478869.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/dipuwajusofazasumak.pdfIn PDF document text
    • http://nut-shell.net/upload/files/fegivimapabisixikitalevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=snyder+cut+hboPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC110 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_01_sfnt_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000effb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 17420 bytes
SHA-256: 8dec90b97087f8659142d56b7fb62033d711b8e8579a4fccaf83bd28aa0d300d
font_03_sfnt_off00011d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D39 10428 bytes
SHA-256: 3c9696c95ca200a333534308b33ee84a05872cb4c862293edf5843b373bc997d

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