Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cffb42a923a5f1d…

MALICIOUS

PDF

87.4 KB Created: 2021-07-19 09:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 78f38a9f4047f2cb59c1b67fe5634811 SHA-1: 39ee979e0a0648f57f0930e1360c69db44b642d9 SHA-256: 8cffb42a923a5f1dec569663ab8dee2823d440929277a2604388edd490008d48
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a social engineering attack (ClickFix). The PDF contains numerous links to external websites, some of which are hosted on compromised CMS uploads, suggesting an attempt to host malicious content or redirect users. The presence of embedded URLs and the 'ClickFix' heuristic indicate the document is designed to lure the user into performing an action that would lead to further compromise, likely by executing a command.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://girilawfirm.com/content_files/files/80589557733.pdf In PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/29280604423.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/32526817457.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/38a50ce7187422f3db6354dc61253995/komawademeduganusiju.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef03c49306---gowizujukekivipigopiwa.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/14907054509.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/xezupamirebu.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/37187903530.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/48798852838.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/54370155740.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d680f0474f6---43551126177.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/5e8313c0372702519cc966740bd59c0b/rugusa.pdfIn PDF document text
    • https://anfauglir.com/images/file/5664488402.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/37838201686.pdfIn PDF document text
    • https://koratspring.com/upload/file/21775854007.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/64626771952.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/xitugofelenupazade.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/vajetizeferobew.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074b9862e62b---xananar.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be172ab0587---juxilujogatona.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b1403b6c5c4---55278060650.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/rawosejago.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd1945392d---fuwivokixilupumewo.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/946b52bc76bc7001ccc18535281676c7/degamagalalukefiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=stop+apps+from+opening+on+startupPDF 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_off0000f112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF112 17604 bytes
SHA-256: 7fe44c65c6e110510c63f474b86b20691ec39574b28c7c8a303f84d4ce12ea24
font_01_sfnt_off00011f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F22 10832 bytes
SHA-256: 925f3e676e9dd40c32d190661d02646cf9a86de19a6776e8cc9494802c357528
font_02_sfnt_off00013823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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