Malicious PDF — malware analysis report

Static analysis result for SHA-256 8040de7312ffba9e…

MALICIOUS

PDF

75.6 KB Created: 2021-07-07 07:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d6437c976ec027b088eb87423dcd7050 SHA-1: adcc95db369222e8aeed71db84f207303a99c145 SHA-256: 8040de7312ffba9ed0f69836c8c28ea8d92bcef4023583bd837d88d1c3cd947f
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially malicious URLs like 'https://irlanc.ru/uplcv?utm_term=raiden+fighters+aces'. The presence of numerous external URIs and the detection of a compromised CMS upload link farm suggest the primary goal is to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=raiden+fighters+aces PDF link annotation
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16070d636b9155---muwababuzizoli.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/10078460484.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608033aa91b52---44104220065.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7ba37915e---menubagawegubifa.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4b072ee01---dugapotubutelulerebawaror.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607cee17b456d---78874761953.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/1516782105.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/razezulokam.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/debabikep.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/88336193815.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/83457434371.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d1fd42cf05b4ae559a0fc875882531f8/77878320054.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/74765cee542ac5fcadddd3df60dac650/61495421208.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d51ec832d3293d06e8b4bdf3e7883eed/80653813726.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/90413230713.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/32195207388.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/15585380791.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf03388745e---tusepenemowabenela.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d9ae5872d---77676811151.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/0de40b5d85e9af36e16e981d8b99f448/suzalididuxopewi.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/reloped.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_off0000c41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41F 17284 bytes
SHA-256: 491f7fda51c1c6dfd3489f5152413c6fc99bf5c245805c2175af1db28a8e3a42
font_01_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001093e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093E 10632 bytes
SHA-256: 6d2094c3a396c4284d95f29ec5039df263831b17537be07a049fea77b768c219

Open this report in the interactive analyzer, or submit your own file for analysis.