Malicious PDF — malware analysis report

Static analysis result for SHA-256 14dd0a381c6bc8c7…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 20:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4074cf76811f3e51c1a8862cd124ff38 SHA-1: 511830dd719b2561a76e715113213d3a82bce453 SHA-256: 14dd0a381c6bc8c7e136c5bbc42b9f4ee972edaf7cacc598b4bc775039a18cff
196 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external sites, many of which host PDF files, suggesting a link farm or distribution mechanism. A critical heuristic indicates a 'Remote Support Tool Lure,' instructing the user to install or connect with such tools, which is a high-risk activity in unsolicited documents. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it may exploit vulnerabilities or lead to further malicious content, potentially involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3da80e4bad30f38d61dc2712adf58686/vomirolunanat.pdf In PDF document text
    • https://giaiphapthietke.vn/media/file/files/4703868489.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/73976114951.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/ribinaxejalakepepobawofeg.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/uei46hfet79bbke77jnr7kg0nd/gejamapalifovuwi.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/72920977292.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/julepakogalunexasoxiko.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614510bd4c96d---19406165041.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/77949712983.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/fatud.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a30b98306---65431755907.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/31274475739.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/28825360906.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/tegowerofonosozemazi.pdfIn PDF document text
    • https://12shio2.com/contents/files/fisapotegog.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/97019112360.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/60904937435.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614e283448efb---66912783669.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/nokavizigapagiboxize.pdfIn PDF document text
    • https://kimansion.com/uploads/file/dexej.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131ee57b4df8---5147163581.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/fadukakeduzebipo.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/35014721936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=videoview+in+listview+android+examplePDF 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_off0000b12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12B 14964 bytes
SHA-256: def466d7bdce8ffe876a87a2574ae58ba6f134dab92d13973bf73b3e9273cf26
font_01_sfnt_off0000d6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF5 10776 bytes
SHA-256: 0850e303c14cff9e7190925d66e9e94dfb0d7aa58442678868c987dd2ff0fd6d

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