Malicious PDF — malware analysis report

Static analysis result for SHA-256 c792abd4b0471d7e…

MALICIOUS

PDF

83.8 KB Created: 2021-08-27 10:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9df0ccac42f212fae49d8bc92dd2cd03 SHA-1: 72c2bcaed1e79df0f4af992f20fe270327669152 SHA-256: c792abd4b0471d7e1639992525da7c3cee7ae04a4450e1c181b0a6029a8231e4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points to an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://crewmak.ru/uplcv?utm_term=photo+app+to+change+sky+color PDF link annotation
    • http://duquenne-moteurs.fr/webroot/upload/files/jelusox.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b907f37422d---wafixedifaluguzinij.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728a1ccbda5---jalusozemolika.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/fivilawidegavej.pdfIn PDF document text
    • http://dothi.info/images/files/34908860673.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/nipinebubimover.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/36497963768.pdfIn PDF document text
    • https://isosklo.cz/uploads/pexiliturepiruwakujexal.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/0bfc52cf1fbac80916f560e9b90846b8/29629647424.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a334a8074d6---38032343060.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/silikutaso.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/fobewudunavunatas.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b40927d0a---rabegisumorekufiloma.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/57518830937.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/63465185433.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/20ac07f7eb45c126527d551eef31a75e/xowudamupifoxi.pdfIn PDF document text
    • http://metabolit.ru/files/file/37234051677.pdfIn PDF document text
    • http://cochu.net/resimler/files/xogavosadolixubuxol.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/tutagabufuvivafot.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/80271762092.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/97796334620.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/weraru.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607756cbc8acd---68038570584.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/jivaf.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/126a0638qhnm9po867chn4c6cf/71678258691.pdfIn PDF document text
    • http://ippon.lv/uploads/File/teguposiforawagi.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/9ced186e91ae10b3678cae561d764521/zosuzesotepasawaxo.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_off0000e293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE293 10768 bytes
SHA-256: cda96a9b6444b0adfec757ad281abede0b53fbf6bcd414c7b29532c5919fde4c
font_01_sfnt_off0000fb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6E 17568 bytes
SHA-256: 23adbbed267720206aeea1d9fe75b57761946f672ef4c27b634fdaa029c4c223
font_02_sfnt_off0001286a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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