Malicious PDF — malware analysis report

Static analysis result for SHA-256 d584a9bd2fc78ee8…

MALICIOUS

PDF

82.4 KB Created: 2021-06-23 19:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 28505db04ebc303bd1194031e73a1bfd SHA-1: 7eaecb76ce25ac7117d470b5c24c06dfc1ff4a15 SHA-256: d584a9bd2fc78ee87f0cf5b8243105907952ced79f57afeb85da389cc8e79183
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm. The presence of these links, combined with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, indicates an attempt to direct users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://krisoc.ru/uplcv?utm_term=vocabulary+workshop+level+b+unit+14+answers PDF link annotation
    • http://am-assets.com/aom/magnolia/userfiles/file/suvofafujep.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5aeba6e75---sarado.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c04fe42ef4---wirufipagafodogikugitu.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106160654053184.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/021db115727dbb7be26502a312c423fd/zujusofap.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/2lrhg72r8f19ih57dh043m77ek/73468292013.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f292a58d37---40924075226.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca06bd494d---jeravotudixilatadafozov.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a73dc68605---fabadilitosize.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8e51d1228---xanitegepeverevujujabapi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3f7160d696d008b95c0db5538e7b8985/napuzusunetuboluxexizumom.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/d53b7964307c115202896adbbec1d82f/maxixibiwikatopuz.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/4760c6ea401d6f8eb99264bbe2d95b71/31223949415.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/fulexo.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/norizovafuwegatilubi.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/porerelojepibozizutude.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BE 6416 bytes
SHA-256: 9e91590ae502ff902ba306624a00c8d44396a7ee9717b1bfa1717db63fe08483
font_01_sfnt_off0000c591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC591 5584 bytes
SHA-256: 964ea0d998e4a3702a94254ce1d93a836a1dc1ae2b628a0cf6bff02b6c712a08
font_02_sfnt_off0000d8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A8 10868 bytes
SHA-256: 5e2d4e6282afd65b84bf00aca32120ff3057f7e8ffb59a18e33ef2d37f6a387e
font_03_sfnt_off0000fb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6D 10044 bytes
SHA-256: 80cb307b320572fcc7fd5ee2a98bb93a7d91aa5571243a6695d80457857043c6
font_04_sfnt_off00011df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF7 16256 bytes
SHA-256: 0c28d55d9957e5be45f9d3302843a1d8772fc4e8a9a81ea04eed1b5cc2016f23
font_05_sfnt_off00013354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13354 1736 bytes
SHA-256: 5095ccdfdd328c3f25b1766e9c65bca58fa839170fcb9f3db3c20e130d955aff

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