Malicious PDF — malware analysis report

Static analysis result for SHA-256 faac7b45577225e7…

MALICIOUS

PDF

64.9 KB Created: 2021-07-28 09:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 795c30978c2a2c25760ccc0c92db19f7 SHA-1: 0f7d2cf7c40976fe09e2fbd560a0d3fa3ffca5da SHA-256: faac7b45577225e725d98438c5b657c17f33d381afac3495f4f52ac1ca59b8f5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8394

Heuristics 5

  • 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
  • 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://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51f74118a---4613475539.pdf In PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c77b570dd8048f1c2b4da21a911f9dcf/vetavuxivefekobebepifened.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/vemezewevexakewakawi.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/65510078612.pdfIn PDF document text
    • http://air-ned.com/uploads/files/zuvijabapakugo.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075d6ad54610---93203273953.pdfIn PDF document text
    • http://bahsclassof1965.com/clients/1/1d/1db829f64c2e26d3b32b12ccabba4d7c/File/fetovekevegotu.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/71581533086.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b4ba6utebitspb37pppt7s9dj2/tavudevabusene.pdfIn PDF document text
    • http://ridendo.cz/files/file/xawupejodeveki.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/sikepokarozusuj.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160e863837c437---vaxugabopigofoseguka.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/49268755504.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/bexebu.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/4vm91sq6g8gsmbca6kikcdcd83/20214590147.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210702055456_ofofle.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/55270405854.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/71506536510.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/56723953574.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/54192914012.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97dd65b0f1---95160765587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=christian+community+bible+catholic+pastoral+edition+pdfPDF link annotation
    • http://irodori.kir.jp/files/file/kelizakanane.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF95 11268 bytes
SHA-256: f0faba0a7acbd0ba06c67b3eb82d051a834a12493384d96d3326fe194481951a
font_01_sfnt_off0000d9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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