Malicious PDF — malware analysis report

Static analysis result for SHA-256 e825d7242194aec2…

MALICIOUS

PDF

88.3 KB Created: 2021-09-21 08:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 71f14d047a88d5cbdb75bf1a2989aa08 SHA-1: 565c7cde4542c35f1ffd7f2074bb28c5d1588338 SHA-256: e825d7242194aec2238f3d2b8e8d0755b539145cc86cc16ba696a8dfa934a267
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and multiple external URIs, many of which are part of link farms hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=roblox+promo+codes+2019 PDF link annotation
    • http://4tyres.nl/public/files/jowekurebarelokelutot.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/13041736329.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/tibikev.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5u90j1oa8ihta4m7gu8g2sl57j/tamegalaruxekex.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/44152795731.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/namamiwoj.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5a6e1b8e7---62194493823.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/64467325837.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/noguladidorazukaxamexo.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/572a0f5652ad9028ccc20756633bf120/4436084437.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/86898344978.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/vopugavev.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/bibebifodevubosobixe.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/68768077675.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/22538722408.pdfIn PDF document text
    • https://kratky.eu/files/file/tojelanimewuxaxapamidem.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/sepizi.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/62995749172.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b44ae285f9d899c77e8908ca51cafa7f/rikekisaketumuxix.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/tamelumuworepimiberado.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/52046350702.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136efb613b18---47427229124.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/xogukibef.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_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 18144 bytes
SHA-256: 02ccff3ddd2804d7d03513856003d91b3f8921532529a3bad1e13447f2bd6a88
font_01_sfnt_off0001221c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221C 10968 bytes
SHA-256: 4e676bdf6b4d5b29785d97fd9e9577525882ab37dda44d7567ab0b2c81958292
font_02_sfnt_off00013b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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