Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d2e3dfabdfa129…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 02:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e7c22249ef4cd39cb4cfce91c88cb0b9 SHA-1: 119830a42d82d422c83e67e92cdeed71456c8317 SHA-256: 53d2e3dfabdfa129e38a9cbe2dfa0c58e6ab240e6dd0c633ea9161beae3a274c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such sites to host files, likely for distributing malicious content or conducting phishing attacks. No scripts were extracted, but the structure suggests a lure to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://xinyaoqiye.com/upload_fck/file/2021-6-10/20210610154944900885.pdf In PDF document text
    • https://anmimar.com/royal/userfiles/file/18154595044.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/19331806177.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a98346ba4---42519870387.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/92342872561.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/galurik.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/21796470559.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/85413976818.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/qnoekml7r0v97ndaelkuem4570/63475355459.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/2vq8eudavueq9p4nivojlt1d52/10609865632.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/09adfdea7ae16efaf9fccca59c43e876/4487302765.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/52ec057c1512d6fbf6632f07f2b71394/kikasus.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/xuzepaxoguzabi.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/65glnsp6027gphjp823hm4ei1t/muluminut.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/15107262025.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1663d33610---darapexolefuvobodilub.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/gigetivujudogafuvufavi.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/46390248584.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160764f73f3cf1---sowifobejak.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/89220858744.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/xezopidejeromemomoduxus.pdfIn PDF document text
    • http://yejida.com/userfiles/file/97793374077.pdfIn PDF document text
    • https://dptech.vn/uploads/files/muruwulunomunokobigazapos.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/pawagasi.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/55720708443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=interview+questions+and+answers+for+general+manager+positionPDF 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_off0000db63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB63 16132 bytes
SHA-256: 5b19aa3b8fead292182d30b6803997a34632c3b92f536ebcfc348d6351dd5927
font_01_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C74 11188 bytes
SHA-256: 29f3cc68b2bdaaa22819ba0db871ad0ede40aa74711abbf07d9a1442b0edce52

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