Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ad7ed1345418df…

MALICIOUS

PDF

89.3 KB Created: 2021-07-02 10:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 31cc6f3f5b1ee37d6ef126ca51f5b2f4 SHA-1: 000ca3834173dff64c051e88c8cf552f5be24281 SHA-256: 52ad7ed1345418df9569edc5d60473c35d775a12ac6a263cfb7dd2b0b5c61016
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, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to phishing or malware distribution sites. The presence of these links strongly indicates an attempt to trick users into visiting malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=success+is+not+an+accident+pdf PDF link annotation
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb52b45387---vitabesinemulazeb.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/fefanu.pdfIn PDF document text
    • https://susta.vn/userfiles/file/gefizusiretot.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/15249662683.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac563b2a7fc---juvofutoren.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b1467d71f80---fudajafumimedow.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/6e4ab7bc10bf6e10bf3dab61839a8964/53354066743.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/67252946983.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/50c2a3f4b1af1c8b3899e23ded7c13b3/49631034646.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/loleduxofalezofolerode.pdfIn PDF document text
    • http://unsersohn.ch/images/file/rosalexaxenuzor.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/25939073673.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/35313878043.pdfIn PDF document text
    • http://advicetao.eu/pictures/file/rivosogujutozibadaniroxer.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093acb0df390---fekakuzumenute.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae507c295a4---33529537035.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/70112836948.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/30218999868.pdfIn PDF document text
    • http://bakoca.hu/files/file/98555481991.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/1mkj8ul7uvcl70vofee2r4mc42/21253300731.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba173f9b8---32294638315.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/23847972069.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c511fa8c9af---72026369237.pdfIn PDF document text
    • https://esz.jp/img/editor/files/nogaregabepegekixunafaso.pdfIn PDF document text
    • 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_off0000fb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 10640 bytes
SHA-256: 9159ec224af32d403cb55c2a7d7483cee49f9b6aa6127ecc59263e8604374f1a
font_01_sfnt_off0001139e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139E 17000 bytes
SHA-256: ffd9afee954f34c1a98ec32cf97e6f9e9986fd6fc78b939f8829afd6e6359371
font_02_sfnt_off00013ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1