Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcb3419a54670cb…

MALICIOUS

PDF

84.0 KB Created: 2021-07-27 11:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1b3c2667a4688e4dcc117c590b49b97b SHA-1: 3c3b195912d4d03f616bbd7be070ba58b11f6f25 SHA-256: ffcb3419a54670cb644bc939be14c76d9d8f2a4f987ab163edd28bd27c4b1c7a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/cg62jokqmjigkv6dndnrd5p0ac/62059088931.pdf In PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608a133b64dbf---tudubovumugajizedi.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/5hlvr0ju505vnqpd6ed31jto2o/74828959566.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609badbc32830---74134590913.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/zetubelimo.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/c7f6903447855edc86931fb0c01bddb3/nosatunososudej.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/33fd19c95e6b5d0548d51ba9d383dde4/47477482739.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/naral6qnbok8i364jfvq31irs4/49313448379.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be460f22aae---39236318530.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/51473112105.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/32808002368.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/femux.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/ie119dgpjoi5c9jukgfd4a0f3s/vebemuvogurulakovoxafa.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/25509428248.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/28277682132.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/56265617417.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/34919520863.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/96002369650.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/darok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2158d60237---55424627097.pdfIn PDF document text
    • http://co-mit.com/uploads/files/19890881920.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d17e1ee039585d742c25ec2c3810f85b/51787350539.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/raxafosezanugobijolug.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b35239958---fipilijekesorupejosipivav.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/sadudegexasix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=lg+g7+plus+thinq+battery+replacementPDF link annotation
    • 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_off0000e103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 17528 bytes
SHA-256: de206187e1596d86626726218343f75bfe2da1fec7259bebf942323e4a6a8f49
font_02_sfnt_off00012735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12735 11208 bytes
SHA-256: 523f44a4d4c5b9984ed308a43ddee822aa308b37469830a55cf027621c73bdfb