Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0fca3bc7867aaa…

MALICIOUS

PDF

79.9 KB Created: 2021-09-04 04:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e940136c499a1a924a0ff2ea09c1c934 SHA-1: 3c9f91e7eb687b1cb109ed0d3cf4c7aefb596ae2 SHA-256: 6c0fca3bc7867aaa1f602b863d125146ad2202bd4313ede4c53012bfce62941a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of these links strongly implies an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/42376ba0ab72bf52fa6af03ad1502de6/98331512280.pdf In PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16099233ea3111---38950394029.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/29721300730.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/87901768522.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/83203010914.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/0e26a7ed2fcfbb75664348067dea061e/votapetusamun.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tahlg6ms1ib7oht78aqqq1rns7/pidalajim.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c37e18b60---20857153879.pdfIn PDF document text
    • http://nakatka.com/files/file/dulagewukexuxo.pdfIn PDF document text
    • https://nasselgrundet.se/anvandarbilder/156/files/bezedekubabeguzijimedel.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/pidewila.pdfIn PDF document text
    • http://aimic.com/userfiles/file/sotoxirifolokemidamewejid.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/b8c26470750b6c46ad4e057e801f56b2/24625045209.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/zonoliluxaletuwulufi.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/24276343063.pdfIn PDF document text
    • http://anupbolivia.com/images/files/44854913413.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5af0135a51470b9780776183d2140a3e/85992013633.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/fujatugofibakemuvodilijas.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/787e444d9d3a9b2658413f3d5a9b7af4/80145348611.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69928c3117---29852762713.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/6daef5fac7372c9ef74565c919372683/dijizuxexovezebitimu.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210728_F1BF9B6F014A9496.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7ce2a75cd---85596679882.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/fugomozudu.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/vunorewixafigope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=elite+screens+manual+b+series+100-inch+diagonalPDF 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_off0000ce30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE647 11248 bytes
SHA-256: cc5e5401d29f9f6c07076637127ef25e3115033f480e57c48d904c547445b9ca
font_02_sfnt_off0001003b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 18192 bytes
SHA-256: b8ff61fa44dc22734ea4b7a9699c0589b1f78c97cc4223fc33ae68cdd33b2eea