Malicious PDF — malware analysis report

Static analysis result for SHA-256 7554ef2f223778da…

MALICIOUS

PDF

73.3 KB Created: 2021-09-18 03:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aa0fde691a565c22882f3b3564f77ba9 SHA-1: 628334af865645bef4ff68fbeeb11fe776217908 SHA-256: 7554ef2f223778dae3530ba5fe6801ba5783b46310278598dd7a6f862caab806
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farms points towards a tactic of directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://laureysnv.be/uploads/files/ziligabosadavirofegodeg.pdf In PDF document text
    • http://debrecen.varosom.hu/userfiles/files/89659606710.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/newakesozijodufufufezepo.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/60693372121.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/30681565675.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/zupolirufixixagipiw.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/fesudedekoraladonir.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614279a9490f0---72993369110.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132280ba9783---90868114568.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613ffde69c326.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/gatuxakafudoguguj.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348091bbaeb---lorasudumorotexuweref.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/28128151486.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/9260534613.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/dufibawuz.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161339d7509d21---gejifelowizovosabifuwu.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/fobulorop.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/2159085223.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/20166038756.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450385d07f2---19267913881.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/65614174821.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/wekemetijelijulebuwatubo.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/91238920325.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/42126535415.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/48146744026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=www+xxzhushou+clash+of+clansPDF 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_off0000bc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6C 10352 bytes
SHA-256: e292b7b13d1789b92d1076fcbed2677de2d6836fa57d5b14b94bce1485f64077
font_01_sfnt_off0000d3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 17140 bytes
SHA-256: 26fa815695be60f1bfbbcffb8f5a95d31547e18262fd5b19d5b0a9c18e8a19e6