Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5c3a85934ec8de…

MALICIOUS

PDF

70.1 KB Created: 2021-10-01 13:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1bff00c871882584d2d43960e2816d2 SHA-1: 2e1d5a62bd6f3e6db6308a6b23896dfa9e51f111 SHA-256: 5c5c3a85934ec8ded75200474dafdfb1096fe1e1bcffbfcb21c4a02f546a88b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://pistant.ru/uplcv?utm_term=panda+mouse+pro+ios PDF link annotation
    • https://rafaela-motores.com/userfiles/file/56161994394.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/36075012512.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/29991601897.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/42760909852.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/90258661620.pdfIn PDF document text
    • http://dharkaninternational.com/survey/userfiles/files/78713900710.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210903213221.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/10901357328.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/togoxeruf.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/mipajimowopurovodesawe.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/mutafiworobawax.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/96899180975.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/mobapapobikano.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/razozimarisumamejumepuw.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/39245369425.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/69806621163.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/353ef2ae1537bfa61b9b554bb169cf4e/28007489069.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/bcb2b4ff61c58fb1d744c43b23912ab3/molefubuxonap.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/nelufaxatezig.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/65057211268.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/sexinamisinonemalida.pdfIn PDF document text
    • http://vinmexindia.com/uploads/bogel.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/sewezenirunemo.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/nanenagokejawud.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae306a15d---23436081140.pdfIn PDF document text
    • http://www.polni.si/Images/files/wunodomomimu.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_off0000b197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB197 15700 bytes
SHA-256: 47c49539d622ff6067e0c77ace549fc495f01d3ba744621753e9c2b9815de549
font_01_sfnt_off0000d994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD994 10512 bytes
SHA-256: fa159ef4f23262840660d8ff3a7acd45abd57cd2b34d31631934ccdf5b3abc50
font_02_sfnt_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1