Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdacb8f6bdfe55f2…

MALICIOUS

PDF

81.1 KB Created: 2021-09-01 04:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a6a1736bc99f3f3a3c76ac20149c206 SHA-1: 6564b3a84e6616d58710d478f5d132738bb3ace3 SHA-256: cdacb8f6bdfe55f2cc1d621ef3bddfcfc51e6c8cbe65f4c51cbe18fbfa920a7a
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple compromised websites, many of which host other PDF files. This behavior is indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://lamekatus.com/uploads/ckeditor/files/pupexugededivenal.pdf In PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f98489707738a4da245a535342e6799c/21001424518.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/drh5frq0pukafrlm34kt8thtr4/zizabududoluxa.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/zojolufowitojir.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/barifo.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/furenijaromoz.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b622c2879f5---57554476484.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16102c6ce56e5a---76218748593.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/sukoruku.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/67636654890.pdfIn PDF document text
    • http://riph.pl/userfiles/file/82843096188.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/59522570503.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/48097821994.pdfIn PDF document text
    • https://wasael.com/userfiles/file/budesabus.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/lenativi.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/95703641570.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f3b487adaac2e382a7313f7cfbc95a46/71963793118.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/98864661305.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/lj8tbk3jbns90tiaoo9ekpk4j3/poseparum.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/3ppkmmmqleonu1l7e1qp80t71s/tolokumopeseranisawidi.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac21e5a4c14---lalokaloworutofesagamuz.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/72779340459.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c326e5c84ce---lavekefiwefogotukob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=acls+notes+pdfPDF 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_off0000d969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD969 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF180 10240 bytes
SHA-256: d7f035988e01f0f0632a3673b2de60ed8044ce1cbd7fcbcb0025da4c18f8604c
font_02_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 17972 bytes
SHA-256: 60b3ec193b134783b48aa14be0267b1737a582f862c94b3a5cb6722617a55aa4

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