Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ebbaf080fb8aae…

MALICIOUS

PDF

75.7 KB Created: 2021-09-07 05:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f41b4b36e65820394b059c444e9f2f0e SHA-1: f3756a10ef46a15b0f0647cee262002f2d0c5cf9 SHA-256: 31ebbaf080fb8aae98246f21b1efec3ba5cc5e2cad2d3789541fbfb539b8e2fa
156 Risk Score

Malware Insights

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

The file is a PDF document that contains a large number of external links, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings confirm its malicious nature. The primary attack pattern involves directing users to potentially malicious external sites through these links.

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=vegan+recipes+for+beginners+pdf PDF link annotation
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/63e2e0cf0a06a298e7feec562a823707/sovozaviririni.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e086d94a58e---tujugerekokodiwaziferak.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/fulurejeganawitut.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/1b86c3dab757efe3165fa65cd26eb4f3/nolabemizeta.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/44555209323.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607addd92f3fe---13765821163.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/b39cb15ec906c880d15f7b5ead0f4196/bozozowabedenevu.pdfIn PDF document text
    • http://acelybio.com/upload/files/jesuxelafadevinivodifew.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/6140138667.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/d74b24aebd0449b6ea95c82f920870c1/2185316752.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb95b1a527---biregoduxomutexejudegivig.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/flqanvkijsimd5cekrevm5m6e6/fizajon.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/pevosotosiwedazeme.pdfIn PDF document text
    • http://sciattella.net/images/file/pinobawujepadimizozuraj.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/udbssr6do86ceiamhgv4mibrc7/pakinedoriboboxurak.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/lulitovodij.pdfIn PDF document text
    • http://tulsacentral1963.com/clients/3/39/398188050227c7f1c8b3045a0a865105/File/73701510180.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/90014bb5d042583b51ca31d685f3e0c2/wobuxonujedurize.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160758490945a2---31326378806.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/f720933be1ad987fdd8bc204aee84cdb/64379720608.pdfIn PDF document text
    • https://yellowstonewildlife.com/lozoperafexipeparixemet.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097d8db48d1e---xenozebebekorozej.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/incqhibmhho74b94j8j2rjq4o0/31036578807.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/lutetitoraxi.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_off0000c60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 16768 bytes
SHA-256: 93629b7b7d357b2661105f0143abbe7ca5c3b961c0631316ffaa2cc0abe6e1b9
font_02_sfnt_off0001093c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093C 10760 bytes
SHA-256: 93f261d69ddaf3e4227c6a207a25eba25f074bba080605df6395b92f080ca02e

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