Malicious PDF — malware analysis report

Static analysis result for SHA-256 8227f015d1bf0f97…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 07:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb9c1768b72948966eb379e729772ab5 SHA-1: 41ee8c4ac5ad7504eb8eea7175f04206510fc66e SHA-256: 8227f015d1bf0f97d196ef5f4617b2768d13d80a5b4ef6f09c8768a8f095f19b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Multiple heuristics indicate the PDF contains a link farm pointing to potentially compromised WordPress sites, designed to trick users into downloading further malicious content. Although no scripts were explicitly extracted, the nature of the links and the overall structure suggest an attempt to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ever0036.com/assets/uploads/ckedit/files/20210620135103.pdf In PDF document text
    • http://reicar.dk/userfiles/file/64978058049.pdfIn PDF document text
    • http://scro.ru/pic/file/75244953677.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/fivurabebul.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/fanixug.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/3312f13671f85fa4803880d0ad669740/49857314706.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/lojuzajokabir.pdfIn PDF document text
    • http://henca.com/files/details/file/bijoxovujuxeluforozudunu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/eda99909d4bea2f73f3197a9a34a9064/dorazagujemafozik.pdfIn PDF document text
    • http://funperm.ru/content/file/7116954313.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4d16ef694---15699629374.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/72509a455fc9b269a20360eac8f12f87/31289212173.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/68044588315.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac471344be4---6351079458.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/b9b74199973c530ae7fadf52b4ed1c18/wusemiziboxaka.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/43895774e699cba34a08fa8551667976/53215408536.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210618054516.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/22178eaebe3bbbdba442dc6b439085d4/54406429545.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/73170683908.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/livodizuxiginosapazaji.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160feacbf38465---13270702121.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16072bbd95c2fa---22727582599.pdfPDF link annotation
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+complete+guide+to+ielts+pdfPDF 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_off0000e4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FC 10764 bytes
SHA-256: 75ade145b061c9bfa453197c09b772d125a25e25afb47f4eb46ced8c025d5a9c
font_01_sfnt_off0000fd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD82 17360 bytes
SHA-256: eb7ec52d72a8018d1a467cc34aed67e541df62839c486a6c6022c5dbd445fcfe
font_02_sfnt_off00012a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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