Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c644ac4b6972cad…

MALICIOUS

PDF

80.4 KB Created: 2021-06-28 21:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3464e6869d1d154507ee570a07c83d7c SHA-1: 8e8ced21de226d3fbb28574e58a26eaf54009625 SHA-256: 5c644ac4b6972cad0a0d0e7195ce8e7d45f98811c27104132373926a24c167bc
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. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to distribute phishing content or further malware. The presence of these links indicates a likely initial access vector via spearphishing attachment, leading to exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbf69bbf4---16125601045.pdf In PDF document text
    • https://yepsell.com/userfiles/files/malakapoferatifutinitigi.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/lowupitusufalam.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/b4a21f9f57610718ddc75ec9f295ba07/21656981313.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25b4dd9db0---19332597926.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/9emvn591sc302d184nrvkr9meg/fepusezedafulera.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/24957981856.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/65715607718.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/74488893041.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ajs5afk8njur8k8bd520uvh54e/winezibezavovutefov.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/62112f44a952ae0c70b87b624858e48f/zokojitonukebofuwinov.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/fofelo.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/91647822794.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/4973266897.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/05983d8ca92212a8e29272fc00bcaacc/68667299432.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/89307801960.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/9179605305.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606edb83c41db---52699140997.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e4ae830259b98322b551ef2ebfac8da7/59339942823.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a88bf80bb85---38438634529.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/fukirilaxotigujakuzuvara.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092dbc2cd799---3788151680.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/21882170536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=i+can+love+you+more+than+this+lyricsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65E 17276 bytes
SHA-256: 7e645d69988ada02d75967f08829e97e83338cc64406ed996af4f324cb8a5e29
font_01_sfnt_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 10728 bytes
SHA-256: 8efb287949ae3b4de649f85b18d86dee991fb29dd933fdf71baf28a9771a7b7f
font_02_sfnt_off00011c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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