Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dda128c6a6e68a6…

MALICIOUS

PDF

89.3 KB Created: 2021-06-29 20:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23738a5db5a3fbfdac4b2ffd18f567df SHA-1: 0fc30f5d133d1d59e6857dfab8345ff3832a71d8 SHA-256: 9dda128c6a6e68a648004a0356d2875c1f36af50e8f0188b24401abcbb443a5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://crewmak.ru/uplcv?utm_term=what+gpa+is+passing+in+high+school
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/45599725274.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160afda819601f---19725069228.pdf
    • https://bandotrading.com/uploads/file/zudobax.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080356305a66---zakulezur.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081a7b50f27b---kejegikagovewojeti.pdf
    • http://alhouti.com/userfiles/file/33819234820.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/9l9euknenv4tfnlesf25dpe353/38296639039.pdf
    • https://beldaoyun.com/calisma2/files/uploads/4424067541.pdf
    • http://meta-min.com/files/1431646737.pdf
    • http://mmckno2010.zkosuchdol.info/files/zawuno.pdf
    • https://aventura-agence.lu/userfiles/files/12243176132.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/9207eafeea6c36ee8fd5f9969d259b22/70652219842.pdf
    • http://kompletucetnictvi.cz/files/file/50698039962.pdf
    • https://angkorphotographyguide.com/userfiles/file/mimefax.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/l4r94nn50r5qie78kerluoepoq/22494615277.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8853535a0d75ab766e549c454091f38c/sirofitekavagamid.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aea9e099a53---2007294046.pdf
    • http://rszm88.com/upfolder/e/files/20210604081313.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fd2f7249f---74195996135.pdf
    • https://alamansyria.com/userfiles/file/wevutawiseneketuxutigiv.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609484b14c6e7---gepuxevo.pdf
    • https://bikeid.net/ckfinder/userfiles/files/25495003346.pdf
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210621_0D1CE6DC36BEBE69.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d66162e741---54266097048.pdf
    • http://aapltd.net/userfiles/file/11982488026.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/132997969.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcbf.bin
8f99f43713e21d45566a57226117c14343c531c98afd7914eefeee75d6f1efb4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBF 10416 bytes
font_01_sfnt_off00011454.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11454 16792 bytes
font_02_sfnt_off00012c66.bin
ef023f863ef8f34dcbee6ab9c651477767e721384e8692e9bdac0f04ad25b3aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C66 16620 bytes