Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d4daedeafd9fb4…

MALICIOUS

PDF

87.3 KB Created: 2021-06-27 11:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8ba480ac2735ba2e8c1c4a6ee61f853d SHA-1: f0901754b523f3db1376bb758959b0cd4da02ef6 SHA-256: c1d4daedeafd9fb432050fedde2747d7b30436ff6502ab161fa9ce3f7a954ff5
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The 'SE_CLICKFIX' heuristic suggests a social engineering attack that instructs the user to press Win+R or paste a command into a terminal, likely to download and execute a secondary payload. The document also contains numerous links to potentially compromised or disposable hosting, further supporting a malicious distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://bilmatbasim.com/userfiles/file/moxurimedudonimus.pdf In PDF document text
    • http://ebslang.net/_UploadFile/Images/file/tilarebalafuvumofapodizob.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/gozet.pdfIn PDF document text
    • https://go2germany.ru/files/file/sawumekonofejeza.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/acbc12c8e6629ba7c89c9b405f8aecc5/dozufiwawiz.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/fovunu.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ca7b252f3---motakaloxukawokuza.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607705aad328b---lasetowodabiseri.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16091aceb901cc---25748190419.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zodow.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819477c8939---69687317295.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0fdd32f71---70441536970.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/6499479380.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/vujovupexoxiku.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa32398bfd7---vitewon.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/galamofafododemo.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/zakiponet.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/6956109794.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/binaxaxusiwejasem.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50735506d3---vosulopujoridibikaluli.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/lamobomen.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc740781993---23885213377.pdfIn PDF document text
    • https://bloomeng.com/uploads/supidovov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+turn+on+keep+inventory+on+pcPDF 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_off0000f224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF224 10440 bytes
SHA-256: 6f509504a7d2ab4a30bd03a8951edd9844d8d0b7a86c14e404487ea1a56c3d42
font_01_sfnt_off000109fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001220e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220E 17624 bytes
SHA-256: ec87a965147c2daa6c230ee20d4d83ecaa187ee16debf4feac72cf22b7fe4e14

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