Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3aca9e8122a6d4…

MALICIOUS

PDF

94.0 KB Created: 2021-06-25 19:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 49383af44b70269376b7dfc007765a01 SHA-1: e67ba8101f6b1edc457d847a5770f2158bc7a959 SHA-256: 4f3aca9e8122a6d4857ba4acf46a7af7e228531103eddd01634e0bc63ab5ac62
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites. The primary purpose seems to be to lure users to potentially malicious or phishing content via these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/avpmsjkt32p2sf02qd6vqdr07g/54841993990.pdf In PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/66645169477.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f83b2a17390e2c2cae1eaeafacea2534/72298341330.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b273f998b73a1aa012aa4d6fdf6f255/46461322090.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/rm28asvg0jhou4gmhq69ev42q3/14823755292.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/70715442577.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/39604570630.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/9386a800ceea953d18c029c0364e3ee9/91861986543.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bab002e7161---dofixarubasidewibiz.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160801adf7ad6c---32987021233.pdfIn PDF document text
    • http://askort.pl/Upload/file/jorinafigumiw.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/nabun.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0d345b295---wokewaranaxumadasusexu.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16091dc267ba38---vukasajedinibibojage.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/27554332955.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/59632663173.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1624238552.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/xufaroge.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877b207cf4c---50377292285.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/mnj58kfdult6jf12cq37fslfd5/47604156238.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/kj9jhmnbv1kejj9sdcefuskmcp/526310768.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/93ce934bfc77b34a1f39919d531edb5a/betomidodatilo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ace38b6b8f---xanomimug.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838e71c5e49---roxivebawojilaboseteg.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0a888418c---57760261093.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/0p85lr28sbru3k722oben13gma/dijal.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/pp0aprb00nm511mfseuencanb1/goseg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+watch+the+canelo+fight+freePDF 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_off00010c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C75 17620 bytes
SHA-256: 471cf0605f7b6d0bf35c0250daf4115ee9cba6654a1224e42415a54ccfab1689
font_01_sfnt_off00013a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A53 10524 bytes
SHA-256: d2b3f2d7d100ac3e778f18132b866d98cb259db8a277d72035505ce7cba8b0fb
font_02_sfnt_off0001523c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1523C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1