Malicious PDF — malware analysis report

Static analysis result for SHA-256 778349b5587d1c05…

MALICIOUS

PDF

88.1 KB Created: 2021-07-07 22:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 349d20f665fba141ca9ad2e9f06c5845 SHA-1: d50a3c365298f15436e5e016c83c8267e6cb5057 SHA-256: 778349b5587d1c05ac7b3d2b4154fdbe28d99a62740990fa7a6750042e991d03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the malicious destination through a network of disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://smidgel.ru/uplcv?utm_term=dry+tropical+forest PDF link annotation
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/0tu0r12efe11v56ug3ns3cvjbs/tosuves.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/b60ac20feee515c914d5e65e75cd0b77/pozototexowidogegomid.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4e4fe26ce---50959078334.pdfIn PDF document text
    • http://sequoia59.com/clients/867919/File/xuturabega.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/bvdth887p15iuf93l3a52inehm/zitapa.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/vn886pnm0pa8m6l9to4d1677ac/tenasasuzanotam.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-7-2/20210702145420104497.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075901f3176d---dikiweporanobidagosor.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1ad3c3180---kakelilototi.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/lobiruxo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/68b71e14dea4059e43fc661409583fe3/tiwezorewegemul.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/61296772315.pdfIn PDF document text
    • http://ezibra.pl/upload//file/nepaxufujoviwijowekavol.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8d002aca4---73448632864.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/91156143927.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/siwiladudaxe.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/54301476839.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210620_AD4CC793670086A1.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f51cb9e534---gafunegabivalanetobuke.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/9634a7c0d77b71765ccd68def40336a3/23358210803.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cf6b78f82---rufutebapapitiralut.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/nunosaluzanijago.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/5f1ed7a248cde0cbbbf7ee0e8519e935/xazofikemuw.pdfIn 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
    • 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_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAD 10484 bytes
SHA-256: 5cb38fa3e0e3cc23a4078c6b2d08cf818f9ea1527aae68ad30be403ec70cc28b
font_02_sfnt_off000127ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AC 16864 bytes
SHA-256: 6748410ba299f30a71e61572ad7b48f520e31debb5735de05d622940f9fc46ff

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