Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26cca0041dfb973…

MALICIOUS

PDF

84.0 KB Created: 2021-07-14 03:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1aa4ea86499146315a047fa8b64e0aac SHA-1: 29ae4057857286e25f95d0d67606862302f37f3a SHA-256: a26cca0041dfb973a689e18a08fd275ddcf65295a2d9e07c3a223577eb6f5716
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=section+39+of+the+constitution PDF link annotation
    • http://csc010.com/userfiles/file/20210626065115_anr8uo.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/gofinogano.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/tixuluj.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/77595250879.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/0cf1de42cbe4ab354269d71f44227668/31482719239.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/29151904292.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/loninelelawa.pdfIn PDF document text
    • http://roughriders66.com/clients/f/fa/fa96273273f04fd2a06feef12b1e4d70/File/wotofixovisexuwa.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/2d0h1mgvjnoniq6btje9jn8rsh/xizexafepinosak.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/65996767146.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/90539273476.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074fa55cb7e7---81845243773.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ff46e5941---sakogegaxupebutabopi.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/zedomepolegomutiwu.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/3cj4qoakelnonbq4icob6dun8l/pidebikemudorageb.pdfIn PDF document text
    • http://davis-wilford.com/clients/5/5d/5d1655677b271656441dfc21bb295863/File/293279071.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/vubifazowesidokofefurati.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/98419521526.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b77ed1af8---fuperojoreparutuxij.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb43a21dac---90441472592.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/isrqh422n7lrnrbniofjd3a07d/darodinixotowemug.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/zoropi.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/butubepebabenoxumofedebo.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/67101401879.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_off0000e783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE783 16420 bytes
SHA-256: 6a89204082c2b903d2e14ff24a24a931b69c26176b090ac79306f4617dbadbba
font_01_sfnt_off0001122c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122C 10640 bytes
SHA-256: f4769c72fe129b58c7b4b865b3620b28eb4d666206d0270b19766adb1ff51e72
font_02_sfnt_off00012a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1