Malicious PDF — malware analysis report

Static analysis result for SHA-256 600d21a4ab0f74a8…

MALICIOUS

PDF

76.3 KB Created: 2021-09-13 11:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 36544046af20d7711b2ab9f9b01a2563 SHA-1: dd37ab79b7879d064f55f24a1cff8e96ff4f5430 SHA-256: 600d21a4ab0f74a878effe4fcfd2f9f36e8add502262e30c40f3092b43f8a2e3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV, and static analysis reveals it functions as a link farm. Multiple heuristics indicate the PDF contains numerous external URIs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3768

Heuristics 5

  • 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
  • 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://crysiq.ru/uplcv?utm_term=cannot+receive+sms+android PDF link annotation
    • https://markmont.eu/editor_uploads/system/files/bozat.pdfIn PDF document text
    • http://kd-council.com/upfile/files/84388998902.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/44312613383.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-10/20210910065418489531.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/kawoloxujuwazolere.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d10bd6f54---mizefuretevoxipip.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/58599535162.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/26480a08108aa52b72d2adf2461ad026/baluzajudakibe.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • http://corkpotters.com/images/99558205491.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ce45f2ffe8ec4f097a5ecd0f121dae62/34685807371.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/xojitinuwodevibimonod.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6e429358f---keleb.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/mawozerewo.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/gomefotipada.pdfIn PDF document text
    • http://eva.am/files/6120686002e8dc63.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/cb9306d27824152b80db6da3a853d256/41484117881.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/58308265999.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/xevebiridewupabin.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/mojajarafukuruxiroru.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/80282950443.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/99266338835.pdfIn PDF document text
    • http://xhzhengli.com/upload/kisomepawugimifos.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/59303786037.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/59615530079.pdfIn 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_off0000d907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD907 10580 bytes
SHA-256: 8b893d19ab6830ad1a92547afee1d21265f1108141ad90add56a560bb5edd536
font_01_sfnt_off0000f13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13D 16804 bytes
SHA-256: 497e5e7ee243485d5b5e455b2b071f4088a8e6af4062ad24554e581724a3f76f
font_02_sfnt_off00011c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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