Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37038cd8313bf7e…

MALICIOUS

PDF

82.4 KB Created: 2021-07-22 23:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c82d7c326fac0cb2befcb2d51b73b4bf SHA-1: 9bc6e31741076f6410d94540407d15f353ed2ce8 SHA-256: a37038cd8313bf7e6aaf489a46eda3159a45b54c5e9e6d153442bcf7c647dcf1
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. This indicates a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8c4347058855c23c2f1b3926985f3a3f/jujevanotidumukinov.pdf In PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b836df141b0---zosabinew.pdfIn PDF document text
    • https://dm288.rs/slicice/file/lapetukizetat.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/08d7825dcaf20ee94cf7f9d44a75f144/55825049122.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7a7f08c41---4026132752.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/616d8e08a7241a60fd05fb6d20a10802/toworusogepotenunat.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/48688164454.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/836039072401624215060.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/90614905782.pdfIn PDF document text
    • https://people11people.gr/uploads/File/14024625527.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9dbd7bda7---biweriresibamupajamodorus.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd30c4e26---xunesegeje.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/sawavikagi.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/100532576708.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/62218381036.pdfIn PDF document text
    • http://bdn10.cz/files/file/96711654883.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/71783071306.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/2cff58c74acd8421ca0f36abc7622e64/fexidakelilifuvurir.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16070e95f95fc1---32297126950.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/nexigezurebalexoluw.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/nobokebeweris.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/66291188642.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-17/20210717062942597842.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/fockn209k9r4vb11hrapmjb77b/49482187924.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/191f4f4db2df89a03c65c94ef0c006aa/legefowaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=i+forgot+my+recovery+email+and+phone+numberPDF 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_off0000dd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 16852 bytes
SHA-256: 5ea4235b1534a87e3ff2f82fd939f5319a431ce17d5c018bdfd1b1c10df296bb
font_02_sfnt_off0001214d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214D 11272 bytes
SHA-256: e9a80d63876c9ebf58330bb102a041a0c672b8590da79778468586b1f6e62818

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