Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4cd3482e09c7fe9…

MALICIOUS

PDF

77.7 KB Created: 2021-09-01 10:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe5119f6726d1f79d453e0bd08976e09 SHA-1: f459b3cf4092f3d309e696c505708c8b28859414 SHA-256: f4cd3482e09c7fe987e9f1230b19b7cee9033715b2f651eda2a4575b6cd9b144
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. Heuristics identified it as a link farm pointing to compromised WordPress sites and potentially disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, others point to unknown or potentially compromised locations, reinforcing the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62f809f565---30600618844.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ab3ef333c6428f4e5e89fc1ba207c343/30691860839.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/54418839673.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/xekasuruzesavulem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e959047f474---12225956502.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c9e08e0a53---puperuguvuzi.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/8616340416.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ae7f54187---38960695737.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/vabaj.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/46065912898.pdfIn PDF document text
    • https://scalping.ir/data/files/file/25184583747.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/nu8dicc516s47f3qnv87h832bg/bujetufi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1e7d7f1fc---kibad.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/wawubiresalap.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/59223726737.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/27385783259.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/86879945120.pdfIn PDF document text
    • http://iviltra.lt/images/files/59553515652.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119afecda229---82775564483.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/ribamepiduxoxewufifidifu.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/4687043609.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/xaleroxasadatofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=fifty+shades+of+freed+subtitlesPDF 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_off0000c8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 17528 bytes
SHA-256: 1b82c6ad5766456279c4033da083ed657e2ef70247b55608856dd1d078458e47
font_02_sfnt_off00010ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBB 10676 bytes
SHA-256: f32d20b50aecf9eddebb55f5a8eed2ba120c8e229176d77fe0e1c1d1eb1f3bbd

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