Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ccafadf05e5d3f…

MALICIOUS

PDF

72.3 KB Created: 2021-09-04 13:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5cba4ef357236f7b918920e943d2766b SHA-1: b492a260af3efe6f42f2de8d4684b9419b197c03 SHA-256: b1ccafadf05e5d3f5e5da0aa54628cc6d80b42659001e9f0e918f7426e18417a
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating an attempt to redirect users to malicious content. The presence of multiple compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=babyletto+hudson+crib+manual PDF link annotation
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/c623f8d05c7db7d55cdd01490010b637/67516748714.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/7176967137.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///61619858450.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/3644504056.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/jorugoniluzuva.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/vilulopadaxebujivedibop.pdfIn PDF document text
    • http://shosholoza.de/file/bipofaseratazoni.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e150238aa90138381cdd93336778e5e3/37338614485.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16097c1367f4d5---sajukilibibajar.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/94260936237.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/wikasinud.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c0c78e17d---80294980674.pdfIn PDF document text
    • https://tonitomov.com/picture/file/worax.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4b8bee6716d5ec60638187661fe45546/34883727503.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a392bd601ac---19042383964.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/83e75706589b2fa806c0e649824fb379/31263565468.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/18177474288.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/80277070599.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63430624377.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/ziwevom.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/likegijunurepazapiba.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160abb4ad01621---88742363709.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49b1377e2e---zazuf.pdfIn PDF document text
    • 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_off0000b7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C7 11040 bytes
SHA-256: 94dcc406ad6027198dd70f5218980171342c685c91604c3d354d17ab54d3e307
font_01_sfnt_off0000d155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD155 16408 bytes
SHA-256: babf29c5c2048e8c7fe438aff685bd128814b615dbe60e65da24ba59af16139d
font_02_sfnt_off0000fbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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