Malicious PDF — malware analysis report

Static analysis result for SHA-256 506152fd0f52b74d…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 21:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 20a362fbd6a5b55674d660697d3bc11a SHA-1: 34e2f191d5c4d7b5330430431495139baa2405b2 SHA-256: 506152fd0f52b74de1a67f70dc635b3b7538b2a9cf50979f2eaba517954eee34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://kleinimmobiliere.lu/userfiles/files/jolumijojapefu.pdf In PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6c52ce66c---zabuperedaveruluviloz.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/26668602842.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/jadokuzubavozobofon.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609237a77d4da---zefeferosogozurinemeb.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/8584959345.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210606222833.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/pizifefepadafukoxape.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fd0b9aa42---depalukufowesabadanisuv.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/v8lt6a2r3qtku7cgm99lpkud11/subosuna.pdfIn PDF document text
    • http://bronia.org/userfiles/file/nonenofaxadaxujerifoduk.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0532b156b---10526631223.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/45616025976.pdfIn PDF document text
    • http://nova-auto.com/upload/91986284448.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210814_6BCF049B6847041E.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/obetg0tcf70bdf836nhq87cb6g/48851720828.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/67280100855.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/rumemisujoxisasuna.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a906c8e5c---sokizolojalolopus.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/72c11696280bdaef8646259f99dbcdc5/gazegukekaruturesab.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/53056140164.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58507e4615---sutisuzebaxudatib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=primavera+tutorial+pdf+downloadPDF 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_off0000cd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0D 10744 bytes
SHA-256: 834afce25fdc96dc9e8477dda40cd5658f5d35ee20a57a302ce8e546b3c5574f
font_01_sfnt_off0000e5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C3 20944 bytes
SHA-256: 21f4e4aed223ce04250bf51b2df1918645e7680f32e40a04a565ccbf2449bcf0
font_02_sfnt_off00011b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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