Malicious PDF — malware analysis report

Static analysis result for SHA-256 3455fa1cb82554ac…

MALICIOUS

PDF

87.6 KB Created: 2021-07-28 04:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a5cd1dbf43a78b75da581381100ea9fc SHA-1: 42d00749b5ab08994ca694871ff321a89b2a098f SHA-256: 3455fa1cb82554ac5d22aa5e42f55df6e2c987294e97349d31b51ee5de4cac2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host 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 https://ihotel2b.com/upfiles/editor/files/tozemamebemonapugovukigi.pdf In PDF document text
    • http://3dprofi.net/images/uploads/file/kawakisadusiminugebifix.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/78745722827.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/cf45e156683b6d84f853da4ed2b39945/rapimikaxapofo.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68feb556b---muxasekewokidisegitijo.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/mabun.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1ad58649c---34697363718.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5008ce092a---junarejeludugozag.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/rg5d06fsdpgfvfa2rl7skp2ig3/11061111474.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2cbe7aa81ddd0607eb34e4cd301eeaf5/58451041832.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/tebilesefopopame.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/338a62288d99edcfb823bec51fd06a96/39959051638.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839590a24fd---dudezizus.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/9af2e4cbb317aff11b218ea038d3e8b5/detabiwonami.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/abe8lkea6cnttorbmg1k33mboe/29956254716.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088efbad3930---balejeka.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/sadakizarej.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc2dcf15db---12912122275.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec27de277a---79150276435.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/90638885736.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/dcb3003aa5bfcdd27294019bb0978c1b/pemapowaluluvodosilezit.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a4c79e505---89110785795.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/xadufal.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d93313731---musov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ejemplos+de+%C3%A1ngulos+rectos+agudos+obtusos+y+llanosPDF 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_off0000edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 17840 bytes
SHA-256: 16c39eb0613d2d45bbe50167fa5e2c92ccf31670ae1be3fc5c7d715bb6038cab
font_01_sfnt_off00011b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4E 11412 bytes
SHA-256: 868194086cff9fbfd924d8633a24aada7d931fe754ef93a0882071aed4fadf4c
font_02_sfnt_off00013579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1