Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc3baaab171f033…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 18:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8249d887cf36a9adc3c6d63093994d3d SHA-1: a41ecc81a74fdd0b6c1054383ee646fa8d3d496d SHA-256: ebc3baaab171f033fbc9a06e7d72b24697e8e5b6468f34a4d84e500b1da40e7f
184 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Multiple heuristics indicate the PDF contains numerous links to external resources, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9117

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.tobywells.org/media/fckdir/file/lexota.pdf In PDF document text
    • https://hattoco.vn/images/ckeditor/files/zetuvuditetisag.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/meruputej.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e3330296af6d2e62531ae027bcf6f110/botisomukotoviw.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/wimuvagaworazosege.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/638e2fd514c0ce8229d3203e297a48b2/rixamowesofilogepefazijaf.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/343389548.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607de0e89cd55---vakuxegilubo.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ccdd879e0---mizemokoxolurofuzozomu.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/wudiwifoxuluboposev.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/50267722328.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/14610517267.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607eb0fc38a4d---ditusimidenuwi.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/kitisegaradukezananirokod.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786d63e41f9---73536321920.pdfIn PDF document text
    • https://go2germany.ru/files/file/lutuvekumebonujulajix.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/36147132514.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/zefuxesuxonuvigijapo.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c5efa0be032---kagijugijofisumarigifavum.pdfPDF link annotation
    • https://okinawa4d.com/contents//files/zufuxasurikedaw.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077a950e4bfc---66668013996.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/zepiwoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=sentence+rearrangement+questions+for+bank+po+pdfPDF link annotation
    • 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_off0000e146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE146 17852 bytes
SHA-256: dafa386119de78dcfec3f51e3f4b225974c6c8e89f21091d1ad982d3c161615e
font_01_sfnt_off00010f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12737 11468 bytes
SHA-256: 52902b3360a7ed72ae2f536eb37b6a1d1f99bd46ae85e1ec439ea97cb70a11e7

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