Malicious PDF — malware analysis report

Static analysis result for SHA-256 db23f635b0b71854…

MALICIOUS

PDF

115.0 KB Created: 2021-05-07 05:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8b13b72fe5cec68174aa5b96d965edcd SHA-1: e327b1d678f6517aa89d05f7b9ccd5dfc22910a9 SHA-256: db23f635b0b718548471ef1152000993c65be885dba958c1a126cfca543ebb94
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://akinmedikal.com/uploads/file/kiwezesikako.pdf In PDF document text
    • http://asiavent.com/UserFiles/file/%5C/zoxumomadux.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/65763b66443567fe1f6c5c7724f33d3c/vedaximomubapow.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf9cb591e0---xuvubazusovibe.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160769576ecc31---14408902081.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/f23892f74452bdbf9c6aed7b4aaadd33/89537535716.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/dfd83eaca3822e6b352fc53345ab029c/mutevatelanukasenozo.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877dcd65972---wafigedumanulibaximijatiz.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/31rqp66sn8sbk41f8t8dhtmne9/55749185823.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160848a1a3955d---gogogema.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/72758177941.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba20c5a6e---wunawobuforaneze.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/u7gthc4rjehakmqpvc59bhsv70/xewukugufudize.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9peap6h563cjco8goqdtffqen4/38333048708.pdfIn PDF document text
    • https://www.neosynapses.com/wp-content/plugins/super-forms/uploads/php/files/jg5ak156icbnmhp8kjsj0lu5k2/87868190466.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ec59927594e290eec6dcae98b3014679/xutuzenin.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/4c28312f669148a4f559fc7a6b446775/jodumejariralevakazof.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c4d04a335---wiwisezatob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=exclamation+mark+wifi+icon+androidPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E1C 3884 bytes
SHA-256: 6932f52b1da7acf0f3c3d8c8e3f6ceafd1f85404610a5f0e98651eaf7e841b42
font_01_sfnt_off00016bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BD1 5172 bytes
SHA-256: 0c0eff6edb6d769827edd3d1605b535a314fc7ea28d04d603afc3cebbba6f8c0
font_02_sfnt_off00017d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D71 12600 bytes
SHA-256: 18f41d0d5fe99a85440677981bbead9619b99994f9ed0f7395776f8639c8c617
font_03_sfnt_off0001a830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A830 16364 bytes
SHA-256: b13c303b6cd85b939d1ac6041ad41c3503f5e86516ee3b0b12ce1f5b2aae51f7

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