Malicious PDF — malware analysis report

Static analysis result for SHA-256 455fd075d074460c…

MALICIOUS

PDF

73.2 KB Created: 2021-09-16 14:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6c812065507bf6220b933c3eb15713d2 SHA-1: b20a895eb7279ac03fbfe98a2f013a005e7f05ab SHA-256: 455fd075d074460c6ca24696794ab31552e62ea82bd45cea0fe8727d915535cc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the nature of the heuristics indicate the file's primary purpose is to lead users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://crewmak.ru/uplcv?utm_term=multiplayer+driving+simulator+apk PDF link annotation
    • http://beta-rc.com/upload/files/kujapiga.pdfIn PDF document text
    • http://ttc-investco.com/img/files/fizupo.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/9181213793.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138f86647674---viperumemunuvax.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/gapododekulubud.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139272e08a93---radow.pdfPDF link annotation
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/vanipejunelerawekos.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/zuwolaju.pdfIn PDF document text
    • http://suaups.net/userfiles/file/bipinawesiwu.pdfIn PDF document text
    • https://invision.buzyhub.com/files/fijale.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2b3561ac6---rufilukafiviboxibifiletam.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/vugituwenaxe.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/wesirirokusakologaf.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/44553722233.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/46025819681.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/bugotopaxigufabesofovexox.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/62059217642.pdfIn PDF document text
    • http://nktrading.qa/file/files/83575140896.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ocu86b643l7r855gsvpr6d5vnh/dexagepedine.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/96327977085.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/razuvituxixazudosototuk.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/39219548915.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_off0000b8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D8 11100 bytes
SHA-256: 86d1dc25634f7f159e78ee851c30ff0c9acdb37481222c7a1e966adfd305fcbe
font_02_sfnt_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 17448 bytes
SHA-256: 446c8332faead870189bce129741e830ed84002672f9fbcc069f0e32ac6888ce

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