Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa394644a5174e75…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 20:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 259c22e7f973562280238fc7a61c089f SHA-1: 2f28887e3b7d9ab7db47bb795b543ffe3c40312a SHA-256: fa394644a5174e75fb89867c938390f3c894e48df112a35df7d7c55e04c9fe3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with common techniques for luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sardavetri.it/userfiles/file/39917394453.pdf In PDF document text
    • http://hzjksj.com/images/upload/File/12878566090.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/m96g5qnd494m8horfbloq7v4a1/wivobeduxo.pdfIn PDF document text
    • http://yilip.net/userData/board/file/28439648128.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/musanuratazanuze.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160781604d56ca---49908630266.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/kujubaferavamof.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/82401502041.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/80834933176.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/94254304588.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/45649639106.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16106532eda396---musipefusunibunijevuneb.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bcfebdf9f---60043841341.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/xogorarenadotisekizonu.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609dba10c2d2b---ruluribosasopixidugenu.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/7s24sk0ie1hqthqtumpnv8hbc4/dikovukogojululobazox.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/13b722eca3230088e7a2dc98459a8520/24530845277.pdfIn PDF document text
    • https://zop.bg/webroot/img/content/files/bemawuni.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3cf0f83337573ef625881c329bba3632/31630149863.pdfIn PDF document text
    • https://4appsoftware.it/file/rekovafibanutoligonanagu.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608127369356b---33353823064.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d82bca18d---50901791141.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ec76c3d13d39f294c7a04f94bf852290/98244201705.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/pajixewekijofenufabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=syllabification+examples+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_off0000dd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 18820 bytes
SHA-256: a48f1bda3aba7ca599ec9bd9741c64be1cdcad485de1bed0b16381933c3e7828
font_01_sfnt_off00010deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEB 11112 bytes
SHA-256: 1645a0e75a81ce2e610bcd7ae00731224a413fefe0653bb61dfadb0eeffb5aec
font_02_sfnt_off000127a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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