Malicious PDF — malware analysis report

Static analysis result for SHA-256 b240248978e91365…

MALICIOUS

PDF

82.0 KB Created: 2021-09-23 00:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2d2d707aaa41dc73fa3070d41c1495a0 SHA-1: a7c2d35ebd02fe1158847f77a279baf007622c2b SHA-256: b240248978e9136587a3248fef18cc70342cf7618456497390b080ed40c3448f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pileki.com/imgup/file/meruvedinidivepuvifapiv.pdf In PDF document text
    • http://naturabliskociebie.pl/userfiles/file/22989209620.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/43161065474.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/37713901844.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/wapatumizejirep.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/ferewirunudusujebe.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138abba6b478---67144426877.pdfIn PDF document text
    • http://parentini.it/userfiles/files/misemazoxetadigo.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210922_161516.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/rubepupirapugal.pdfIn PDF document text
    • https://masihpt2.com/contents/files/39403499331.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/59574254070.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/lasutefoduwofavopo.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/81e45379be3441031bf64cae53b1a576/68026680985.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/71763163206.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce4ea61584---jexegebamuvadaxurawi.pdfIn PDF document text
    • https://petroservice-eg.com/userfiles/file/39252538363.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/92294653077.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/viluzamuwomow.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466f6f7cf1d---37403101425.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613604ab47a99---86708575107.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/ledivebepoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=android+oreo+rom+downloadPDF link annotation
    • 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_off0000da6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6A 18800 bytes
SHA-256: 62d4ede9c86f1f8ee0ef157975b82fa98e98ae6f809725435147cdb9e6c82a7e
font_01_sfnt_off00010be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FC 10208 bytes
SHA-256: 8128294ef9357fbe5f62260120c865835113bc7f85295c289bf52482fa4f92ad

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