Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b8867e2b9700fc…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 03:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0dc00b9d01ea7003180b77dbe08d129a SHA-1: c7af337617cf7be2b52ace2a1815cc621a9b3d24 SHA-256: f1b8867e2b9700fce228a0b057764af6fa8eca821ec1d60cc9e617823a056668
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9160c4566f---54489675115.pdf In PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084230d2c7ae---67174361364.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/lewofitunudiz.pdfIn PDF document text
    • http://prosquash.by/data/16725446373.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160db19f0d2536---mokumudomibugexi.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/25a434f75486e51291f46758a6729033/59498247015.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/7446806906.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/66794076151.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/h8insodcka78e0f6bkvh45mapv/xobirufitutagokezipoz.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/taragatobawipidilugajit.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/60124182192.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/gonuvorezevomi.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210603_113308.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/82869649264.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/nokimujabij.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/vejojabinofamolekovur.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/23263766089.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/tuvir.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/temowedumom.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/xunidajaxewobuno.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098900009b4a---87967838676.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/20301072585.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/wazewoguxurawakifepusamef.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d5b4cac24---92547399880.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/zifujofotapinemaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=talon+post+hole+digger+manualPDF 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_off0000d75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75F 18420 bytes
SHA-256: 75e29ecb0c913e403ccb60964d4f6dc01b609a411bc12eb348e6458d7b4e6cc5
font_01_sfnt_off000107b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B8 10904 bytes
SHA-256: f10a890cacb2a2011831617759295aa27a86fbf95676ad1e0f318b5651affafe
font_02_sfnt_off0001208e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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