Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3130e24842aae9e…

MALICIOUS

PDF

86.3 KB Created: 2021-08-14 15:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 21a13b818496febe5097494e9d0e1b2a SHA-1: 8c9e784b86dd9b77a5958dd1969c539522e556d4 SHA-256: f3130e24842aae9ee9ed0c1921852812d31fbf521c60219af44079d1bc80e2bc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://bukharaatlanta.com/sites/default/files/file/96172240569.pdf In PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/69e3630ad18e35b4738948767af7a947/10800790540.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607175fccc081---xoxokon.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/7529564974.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/26734269402.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/80466c0903d43e5c9e8cb1fd80de7ac6/luvotiniwi.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607871640e625---xurukiw.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/em0t34q58f566k02i2khdqmvv0/67171838411.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/totogab.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/83170409211.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/rilatodabulepogujotu.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/50692043924.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b59123dec8d---75775194821.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075afec19b89---23375770421.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/7ddi8m3nqdutqtkmarv647qglt/jedubaterixelevobevizim.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/bejudibaserub.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160875b58f0c9a---1037194401.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/tupatogomal.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bc9205cce---72236540652.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/bukonunuki.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/tiviruxitibumutolalagofo.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/fc3c802f563809fa12aeac34ab6844bc/xapadex.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610b2de65da48---14324206505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+is+meant+by+imprest+systemPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/00d45c54b297eaa51d3a1132982e031a/96646205366.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_off0000ef3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10750 17008 bytes
SHA-256: 9b4b4f24ba2f4a2360fe4be256b043c2e0992b2608bbe5258539e615894f13c8
font_02_sfnt_off00013349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13349 10596 bytes
SHA-256: 0b2958dd5f900126a7143893ada398154353649d361f2131a645738cf420a74e