Malicious PDF — malware analysis report

Static analysis result for SHA-256 57656b1e0abc3f9b…

MALICIOUS

PDF

89.1 KB Created: 2021-07-15 21:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: df8f1a0467968de32fab1ff34f360c8c SHA-1: d48310dde46c09b86f4be17281620396f8e4a4f9 SHA-256: 57656b1e0abc3f9b477ddeaa3487e1038cf0e75b179e8534a0440a252f4e810e
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and IP address literals further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://laser123.com/geektic/files/baboradukafefuvuw.pdf In PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5c4daac2f459390ab0d205f9ea4b863e/jenoturo.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/mowabapudadakusugajazeta.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/jv09e8famdfhi9oogusmh295eb/87074607161.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/fexazevegeson.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/puzisipofek.pdfIn PDF document text
    • http://linza-market.ru/upload/files/dumoxig.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3ab8f70b87---33818354272.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b9fedefd4---likutavazovada.pdfPDF link annotation
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/4qe9dfnpj275avu6b2ih2743gs/kekimudezulajok.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609524e7bfb50---89220141838.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/gezevapibenalinujese.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cc26c718a---rafodemawuvajifozodeduxis.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/veduxovin.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16077e621ebd88---dokizupitajawedepukov.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/lqdr4kuc8keuhtctq4hl7b9fj2/57840277785.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/kanafekixonokanabajolosow.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082838454c8e---narikufolazumafosar.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/656002b126ae6c9ddd763820545ab8ca/tejobogega.pdfIn PDF document text
    • http://boxethai38.com/upload/file/87613076738.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/20807205489.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/zoraxepufu.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/wukoduwasikuv.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b67b20807e---54467111215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=wolf+of+wall+street+movie+free+download+for+mobilePDF 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_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 17296 bytes
SHA-256: 8cba364e77a7070a7e16aa4d61ccc961ea7bfc2a5c16d150a2708607a6f31949
font_01_sfnt_off00012403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1A 10800 bytes
SHA-256: 1d1fc871d057bcbc4381d1b3adcaacb34e4df1e5c6561502373f250172659958

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