Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a872fad7b49edbc…

MALICIOUS

PDF

92.6 KB Created: 2021-09-18 09:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3ec773edf8585460652394f408bd6afb SHA-1: 8fdc9febcb2545ff7a943f360958f8581d1a8fdb SHA-256: 7a872fad7b49edbc5dee00ed7fcc6d3b8d29eca329f96971a83620533bec80a2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614331f5c1025---41662868468.pdf In PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea8eaced5b---78534703057.pdfIn PDF document text
    • http://beijingteye.com/upload/files/jafaminubolero.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/razogal.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/razetadi.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/pitura.pdfIn PDF document text
    • http://denge.aero/upload/files/bapagabar.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161404cabab31f---jurusetoposimafejagimi.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/63188400986.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210918_EF8FF64D45D5533B.pdfIn PDF document text
    • http://capital96.com/userfiles/file/48991230909.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/kusuzavojofeputagagu.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/7672736424.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/jogofopukudusuda.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/vekudiwako.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/kuwuwilowutaxazabigisop.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/42810435340.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/gagowujituguvebamumikelik.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351c527ed43---22208296136.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/94706114160.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/58899868126.pdfIn PDF document text
    • http://clingac.es/d/files/92671496174.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/62445190284.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134ffa96f014---68204728461.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/49841318158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+get+free+robux+on+android+2020PDF 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_off000103e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 18228 bytes
SHA-256: 1706115068ffd6fc4d11afe05aa98a504b9bb5bb9bd29cfe6899634db9aa879d
font_01_sfnt_off000132d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE8 10976 bytes
SHA-256: 9e2193b1a0aeb3c5b16c7c76497d0a5003933be40f15253302a587455c0131ca

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