Malicious PDF — malware analysis report

Static analysis result for SHA-256 505f62186f91d685…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 03:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aa9892f6ef20cfcec3b5cee4d0f5278d SHA-1: 5da2054033e6d7a378be2f577bd43ab49c36b19e SHA-256: 505f62186f91d6857fb65d88e4dd186c11243cb2642760f81dd1255bc3eb7d7f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, with high-confidence heuristics indicating it contains embedded JavaScript and links to algorithmically generated URLs hosted on potentially compromised or disposable domains. These links likely serve as a link farm to redirect users to further malicious content, consistent with phishing or malware distribution campaigns. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://binarbaidrealestate.com/public_html/userfiles/file/ponafirakebesax.pdf In PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e941dcfe2d---87607626010.pdfIn PDF document text
    • http://trivio.it/userfiles/files/11134000637.pdfIn PDF document text
    • https://dananeye.com/uploads//files/202108070654557287.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/bobef.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/37899605299.pdfIn PDF document text
    • http://erictex.com/ufiles/files/gatifejeregodinezonotux.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/54823883891.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/2272127002.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090476dccbde---tibaxodikun.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/49e9b7ad31df2a4dded82eb2b6e62d4b/60465647451.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123662695ee8---63949210822.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/31459466796.pdfIn PDF document text
    • https://fasaac.org/temp//files/27286754435.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/dafumuvalovoxufet.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/gatulibirowaberobafonuv.pdfIn PDF document text
    • http://uteambio.com/upload/files/munoge.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/67566134324.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210827_200352.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/13087222938.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/146d4c2970f7c441b32b87f99d20fbc5/bedavoregipezanurejika.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/32375418640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cbse+class+12+economics+textbook+pdfPDF 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_off0000ccaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAA 11216 bytes
SHA-256: 1abddffaa55d16393ce2e2e044c08afe8ffac02e97338ec785d72e15d0cc42d1
font_01_sfnt_off0000e6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D5 18828 bytes
SHA-256: 90c07aa14c47b42a7a1613e754965b37bb7f20a0187ee1c9cf7df9a508952d43
font_02_sfnt_off000117a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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