Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb67a0f30ff9c94…

MALICIOUS

PDF

81.0 KB Created: 2021-09-22 19:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 35ca5373b75233f59747070e3a20e92e SHA-1: 78a315e7968894d3bf663dfd647cb9d7dce5fabd SHA-256: 8fb67a0f30ff9c9436d73bf1f61dd6379f099e55b7e51f7d8694b967d35da3d2
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, suggesting an attempt to deliver a malicious payload. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161326e455fb5d---sejuniz.pdf In PDF document text
    • http://langeline.com/ckeditor/upload/files/zarigej.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/tiriwejelodurus.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210904141118.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/99089266769.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/rifavopolok.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/7749014870.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/misuwuxovesivut.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/78733390934.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/gidedojowufo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142149ca1650---gexagagogumojozagusem.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1cc2d1437---33668024973.pdfIn PDF document text
    • http://htwy.com/upload/file/12327941312.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/zozuvub.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/57655815395.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/79302012013.pdfIn PDF document text
    • https://peterdegendt.be/file/70620803964.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/tumegupawupuxawusiloxer.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/67869273100.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/81982980708.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/60477842326.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/56241611297.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/fidunavijatotutoma.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/kopivegudugexaxinevawov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+lock+phone+with+passwordPDF 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_off0000d860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 10780 bytes
SHA-256: c6a0bec2388cb2e0ad1c1038041fab89f05f242e851d398a9e34109accd0549e
font_02_sfnt_off00010941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10941 17520 bytes
SHA-256: a3a211fdf91b2b3d0bdb0aefa514d25aa067b725a45f564383bc072999644b1b

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