Malicious PDF — malware analysis report

Static analysis result for SHA-256 5352df2e04044ff2…

MALICIOUS

PDF

76.4 KB Created: 2021-09-18 14:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0c1d2264446001e524d96a3484ab93f6 SHA-1: 029d7859b2f97ec6af2961e1136287f234dc3c95 SHA-256: 5352df2e04044ff27d4122615b12e6f1c471d4a3664e0a36b8512dcc2c462c7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://infrive.ru/uplcv?utm_term=tv+mate+apk PDF link annotation
    • https://abhimaninteriors.com/ckfinder/userfiles/files/87586872790.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/28512041168.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/501de88bbd62442649748dbfe3cccc09/bivodulizusefalimubot.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/zadunekoboxabozanojapa.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132225287084---kavusolamal.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/boliris.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/jijugu.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/67725977961.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/dojekolukunenusawakujabe.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/3001869548.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/73670435987.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/sulukevure.pdfIn PDF document text
    • https://alohasafaris.com/files/mizaromufuzaxigugonijusu.pdfIn PDF document text
    • http://philipsphotographystudio.com/38484950326.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/34369509227.pdfIn PDF document text
    • http://saimiri.name/upload/file/41588183061.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17466612867.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d27fa54178---21056202472.pdfIn PDF document text
    • https://shibbirs.com/media/files/92160686345.pdfIn PDF document text
    • https://domilot.com/uploader/files/82599667121.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/gidewodofibujebuzamaj.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/4278463671.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b3cce9b3c---68411863704.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/mivoromozivirowovanafeba.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/84865679787.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210911035801.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/naxakovupanikuzusofuzepon.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_off0000c698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC698 9904 bytes
SHA-256: 7ee90af94c5d86dcb4b4f915a7c2f705168e0e3d505f6e42e57a1aa222065498
font_01_sfnt_off0000dc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC80 17940 bytes
SHA-256: a1b79b58bd856bfc483a69fd90f91cc04da6280328a9384ca94eac476f16a038
font_02_sfnt_off00010ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1