Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c05c41242a27896…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 09:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 850196ba0efa46324a97b9d731bc0170 SHA-1: 112542e3fb282b1e9a836e59936f10df5bfea665 SHA-256: 1c05c41242a278965e81c26f11b97debe791c9e61c4cc72bfba24d24456ff148
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress sites. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely for downloading additional payloads or redirecting users to phishing sites. The numerous external links, many hosted on compromised sites, further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136402b32d85---89820059884.pdf In PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/87689978613.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/38222266319.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/80522197243.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/12540334345.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/11571870316.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/zixenovu.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/82295945877.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/rozimegolokakuleredipuru.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/dafiluguvivojegu.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613320aee15f4---11075618388.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/kunirajetove.pdfIn PDF document text
    • https://fratellifurloni.it/file/67114458111.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/boveropawe.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/30903871275.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613a674a28c3a---19922819637.pdfIn PDF document text
    • http://anninh247.info/upload/files/84701570046.pdfIn PDF document text
    • http://koddous.com/userfiles/file/pokamiguvezapipidowem.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/da5b7b7449e5de0dc2703dae3580ba0e/mutadudinumit.pdfIn PDF document text
    • http://askort.pl/Upload/file/kotunupukapoxuv.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/wefotujaziboru.pdfIn PDF document text
    • http://vswet.ru/f/tizupatijonumog.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/99370092265.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358e835f925---23293373633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=watch+after+we+collided+online+free+putlockerPDF 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_off0000dc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC06 10820 bytes
SHA-256: d2156e843b6044545a1de8c709ef20dee1d075317159768c2af579a4c64cb8fe
font_01_sfnt_off0000f4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 17844 bytes
SHA-256: a2c420458324f46377f91c8731d6b725c4073f06c16e17bd23c09e0767d48645
font_02_sfnt_off00012316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12316 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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