Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05f6f402cbe51db…

MALICIOUS

PDF

94.6 KB Created: 2021-09-03 10:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7b61dfc0b9591bf3f7d1cf40d63a320c SHA-1: 957ed15a1cb5fb74b793f398a46985c6027f4f28 SHA-256: c05f6f402cbe51db98797d050b6a136089fad424f6e00620f91658d5cda72a42
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document employs a link farm strategy, presenting multiple URLs that point to potentially compromised WordPress upload storage locations. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • 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.
  • 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://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/zakireroza.pdf In PDF document text
    • https://motelandratecuci.ro/userfiles/file/tobeweposuzewipokuji.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e393dbebe56---dokevoti.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/vunutoguwop.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607404a09e85c---gibejub.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b5348f320---83188038188.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/xiwevuse.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160bdddcc5a4e7---ruwowuninolinaxupipakaxub.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/xofivaju.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/35177768988.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/5091018292.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/4443956677.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/73758786126.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/52905792261.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/kokozasemuf.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/baruwafofalorobewa.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/xowumuti.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/d809c7eb523c22ad5492cc9f496f8b3d/14308815299.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/tatedetupidinapavulit.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/9647c66dfae4d0cdfce9a6f84eca42a7/jijila.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a0c0d565d---31857980528.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/18790712411.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/88251397494.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/92725b5816b75582dc5a17b068b80f21/denanamadalisatoxolapak.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609096e51c07e---94009345009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=livre+reiki+pdf+gratuitPDF 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_off0001073f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073F 21308 bytes
SHA-256: afa0c7fafb48501ce1558f05ec75565cab3e3de46bd9de4c3d0b37655b9c9486
font_01_sfnt_off00013d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15549 10448 bytes
SHA-256: 440b38759c1256fe668b8ead861b026bf4ea8d0c206e9859a369a0ff6bdddabf

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