Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfc5345cb33d2ee…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 10:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7f192b52412e8392f7c7fa648ab12b33 SHA-1: b0aee6d86e56f444e431416c5578e68285a7f85c SHA-256: 8cfc5345cb33d2eed79c467df1890ff558a138599b32e399adcbd8932925dc90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and disposable domains. While no scripts were explicitly extracted, the presence of numerous external links suggests a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e269a1bf062---nojaxofavesutigedemejiken.pdf In PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c242d4fa7---rizunojipaxewum.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c64ddd27bdb47e03468d7ea688fff7aa/mujuzafafenipusetazojo.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/91515440815.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210805002059292.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/posebaloxejemagofozovil.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/fe1b705d996d6d4b36c130a76b2721ad/rifujovajupejital.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/zigenapexesidexa.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/waramuzebil.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/xomumunizopub.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/kugajewomulelakelutamerib.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/060bfbb52584332df712fe0b6445585d/mutitewol.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/ad4d6d4cff21c488fb575375e8f1c9aa/wivodejeg.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04b4758486---3596533842.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608076b44a7ee---18789335345.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/96419186995.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abe705b38f---73430281453.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/77600777852.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/8e60d23c1cabcfc7c777416601307058/64904097988.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/dbb87e51e3eb27362624416412664f5f/maxuxotuvit.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/razuboguxivumelalu.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/53300818720.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cbef97cc02e---88858879553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=resume+francais+bac+science+pdfPDF 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_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 19776 bytes
SHA-256: e991440ada8ad1e37e899663e504a31929bce0abeb305cf870cfbd5d0f6e2052
font_01_sfnt_off00010c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12460 10804 bytes
SHA-256: 4cc073b8d739199b266eb06e6b8586d6a3ce925d6c3e7b44cf51d017fc2870c7

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