Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5953952a347ea58…

MALICIOUS

PDF

84.6 KB Created: 2021-09-06 18:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ab59b2bfdb5d7689ee0284b78fd30a4c SHA-1: c8974fc78c85a47ef09f39ff84e205bfff7f02f8 SHA-256: e5953952a347ea58c8a017ef4c8d404b65e3980176b5fe7b57cf03e300ac8307
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to URLs hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://healthmatters.me/userfiles/file/56113533906.pdf In PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/2dba703844d54858c6a4f1ca33a77104/riwijoruz.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/14299799850.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/lanufedelukuda.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/palovi.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/28423311260.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e647d12a42c---kelimofafamil.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c4db890c19---26240961626.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/vulabajo.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/7ltop332es36ggku31djhf835b/75402768877.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/tgpf1mkd0qhmqmpb93b2vndfs2/dekeb.pdfIn PDF document text
    • https://eamenfaraz.com/cache/fck_files/file/gopijomebu.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/9a801d39abf97270087f51b1ade481ad/mutez.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/dafadusu.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfc277a114---73168633514.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/g4d4b90cucr9fgbqemuq6jjvp2/65866992921.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b26ecf6700d---1951677703.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/femexulufedaboworopi.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/5ee7147d5a1ff5864184ffd8729d700d/bikixedavamofabiz.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/gezaxowaruworuluvugosudoz.pdfIn PDF document text
    • http://446888.top/userfiles/file/76970158292.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/14698418273.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16090fddd4bbfc---60485149239.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210722_184739_6857.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/wewol.pdfIn PDF document text
    • http://babamoleskine.com/files/file/gazobuvipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=organic+fertilizer+production+project+proposal+pdfPDF 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_off0000e73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73D 11112 bytes
SHA-256: 8c3e32cc587fa7c48443deea60e05a1af10fde6b989abee7ce26c86fe8a3ba05
font_01_sfnt_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11933 16484 bytes
SHA-256: db9ac3ca00b821d59a3785bfebcc41624ab8511a78239d06f9dc06ce0132f41c