Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c858f07265f8fd8…

MALICIOUS

PDF

83.7 KB Created: 2021-07-02 15:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 24f3aeaa3bba610bbb52f1796b338157 SHA-1: 3a70b398cdcde6ba3b803427f43d5a734f768a2e SHA-256: 4c858f07265f8fd84153c447f45a24fd7871f10b220ce207416ce2ea7708c329
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://turagent007.ru/userfiles/file/gobul.pdf In PDF document text
    • https://radmangroup-ye.com/rgfiles/file/83810148447.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/24962180259.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ha32hht350u334mjojo45ccsk2/kasafeponabotinovova.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/fqov0ouab2d4un76v6oha2srq3/mimonozoduwerawot.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/4d1fc8a258d6a62804a625b61467ddad/59208357078.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a575c74018b230fe431c90dc5264416e/butizenigo.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/2035026583.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609acba102d13---14048990237.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca550e6d92---41194231100.pdfIn PDF document text
    • http://nensi.si/upload/file/durunenawo.pdfIn PDF document text
    • http://effektfilm.de/files/file/nakotekek.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/h2ur1vnd4e3kujlauv0iu0m5c3/domujepetevekotuwipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=merge+multiple+html+files+into+one+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_off0000e3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 17276 bytes
SHA-256: ebd5ee21597bfe855e733a839bcb19c5e12e2a2a33ee19463660d334821418d1
font_02_sfnt_off00012961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12961 10876 bytes
SHA-256: 0d1e7376af2b2a776db077bf775c1aba55a0aaced7b8d2e6c335edd915c2b8f8

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