Malicious PDF — malware analysis report

Static analysis result for SHA-256 57551f3b114bc735…

MALICIOUS

PDF

74.4 KB Created: 2021-07-07 14:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f36a0bfa2994481e7fcb93d0dc3ca7f4 SHA-1: e912064a7ef52bf27e392a321378957583ff9f5e SHA-256: 57551f3b114bc7350ef7b55ad82dd7ae97f3e2be6bb36d6b09cff01b763f75f0
172 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous compromised WordPress upload directories and other disposable hosting sites. The presence of urgency and download button lures suggests an attempt to trick users into clicking these links, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080d942f1148---24696060856.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/93f1675c567f4e92e9a1c7b83076514c/97347896829.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/67b2ad3da7da36b1e309c055d08b02f0/nikujemurevivukego.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee46addbeb---99387560288.pdf
    • http://brmhn.com/userfiles/file/20210523204554_pi4e5u.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c44d6164d83---24304315773.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/158f9eed7fcc4be90f2d814851da826a/54213180023.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/mapuxugibajofirojax.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/0f58e16486dfdcc393b0728607db140a/26506027154.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/0tu0r12efe11v56ug3ns3cvjbs/tosuves.pdf
    • http://1975geegees.com/clients/78603/File/84581547750.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/tt6asfcdop71d3ungusle42srf/85432389324.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/43325548980.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607278b2530ac---kevuketud.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/od3t152j08i9o5rvkpmq52poti/69411181162.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/bcb82a95619e76688f0f56cd29f9b129/39760302721.pdf
    • https://abugfreemind.com/userfiles/file/dewopemoboneb.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/32d873576884c92e4b1e44beb508bc28/19002993401.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca96cd9441---24862647338.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/361c5b5cadb8a7f23c4323b6593744df/nelisa.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160736f18eab4d---mewezexizabixofizibepepab.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=watch+the+hobbit+unexpected+journey+123movies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC50 16792 bytes
font_01_sfnt_off0000d467.bin
259ee9acc03d81f709c5d17c08407216240f7725e68ad9c45246101c81228946
pdf-font-stream PDF embedded font (sfnt) at offset 0xD467 11720 bytes
font_02_sfnt_off0000f021.bin
e469b38669530d43dd279da8e237378c253ce45a09034206b3b939ee328d011a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 16908 bytes