Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd99df80a45e1333…

MALICIOUS

PDF

74.9 KB Created: 2021-09-16 08:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73a599772056126ed4da38dc2b11116c SHA-1: ff3fef6280d39863b3389d56512b75214cb9fe75 SHA-256: dd99df80a45e13334c189902e1c17e44572c97d8a7de3c3b4cf6351637126703
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. 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 URLs and the heuristic firings point towards a malicious document, potentially leveraging PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://garglob.ru/uplcv?utm_term=8bp+mod+apk+anti+ban PDF link annotation
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210913211456.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f915683771---89838386214.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/51531725836.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d8b51a6d8228ba324040f859ef28e9b1/78980003909.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/radaketutelizonuxu.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/lofekolomumopufozew.pdfIn PDF document text
    • https://mimpishio.com/contents/files/nigoke.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/xapilaforimegefemijiv.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137b47f0051a---bojegigano.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/wowogowazewamaj.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210913155222_3gaika.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/74464009118.pdfIn PDF document text
    • https://angkagenap.com/contents/files/61670601515.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/bibotaripasuboluwodi.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/vufetofexebutedawoweva.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/judexosomexatetisodimomo.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/51147542791.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/janajosuzubigazogedor.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/83169381071.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/90656521083.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132a5288c66e---79442587851.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/xozudebi.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-5/20210905124808566142.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/vivevujopiguwuwuvojap.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-5/20210905221813928186.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/7087655094.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC589 16076 bytes
SHA-256: 25d261043aee91c41d24133410a0fa09dee2ab283f2477de75a504ce4a8ff7c0
font_01_sfnt_off0000eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 10448 bytes
SHA-256: 899c0bf7338180064d8f0b79147cd7c8071314e737f3963d871b6650a551e286
font_02_sfnt_off00010616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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