Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38789d40d346681…

MALICIOUS

PDF

117.6 KB Created: 2021-09-04 15:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 223a92950b380a58ebcd68e3d18ae9b1 SHA-1: 414106fd8c3c6168397400e06c8dee0fb4e25e8f SHA-256: a38789d40d3466817f69578682833c98a3c9455723e771193adc6dddd4607c0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=fu%C3%9Fball+wm+2018+spielplan+pdf+kicker PDF link annotation
    • https://paperland.bg/uploads/file/bakodajusan.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/funudadidibavolu.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210625_053017_4749.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/34244296283.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/bkb73i637ujpc1m5v9770shjkv/18491469825.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/64381524422.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea62766d87---watetolusibifodiwevuk.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2638b19f2---fusajavux.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b139d63bea---sidijubarixezotej.pdfIn PDF document text
    • https://huanghecables.com/d/files/duxoko.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-1/20210701180338503631.pdfIn PDF document text
    • http://museeducuir.org/upload/files/muvutepagosegekopuza.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/duzimerogidogomagabik.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/mepajarigoditif.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57ffa218b---65861622174.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/77835596615.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021072607012380.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/55972749117.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f74358c0cf---17783531043.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160928f95e562f---jufaxutozofewimeminig.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087db85e072d---lifisulusejezewaludufu.pdfIn PDF document text
    • https://serka.com/serka/upload/files/dewagonefixa.pdfIn PDF document text
    • https://zold-kommando.hu/files/66023668895.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_off00015414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15414 11668 bytes
SHA-256: a1a47cff6b0ac13e33b79c838d5727400c369c8e062a6e8c598b5a2621453cce
font_01_sfnt_off00016fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000187ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187CE 25172 bytes
SHA-256: 00b68b1edff7fc9c3f76bb2209d5397baf0f3cb2f99bb4352a69effc01ee6bdc

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