Malicious PDF — malware analysis report

Static analysis result for SHA-256 877121a12d99ad10…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 06:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e905509b4de80060b6fa98cd4cc3f791 SHA-1: ae2af758ed805ffd662a2522879c1e44e833c130 SHA-256: 877121a12d99ad10e3ec16d5b0e196f8ab29e0f5ac56014167d961138ec38aed
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely exploits a vulnerability to execute code. The document contains a link farm pointing to multiple websites, several of which are hosted on compromised CMS platforms, suggesting a phishing or credential harvesting attempt. The primary attack vector appears to be users being tricked into opening the PDF and then clicking on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://doctornhospital.com/banglanews24/editorsfiles/files/fuzidebiken.pdf In PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a660233c419---21049623787.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/sexuti.pdfIn PDF document text
    • https://12shio1.com/contents//files/toxoxugerutonetuve.pdfIn PDF document text
    • http://zuche0551.com/upload/file/26660522229.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/vujaluvumumumot.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-8-11/20210811195912142997.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/a2fca2ef5a14f9f713111aba523c7074/89056683932.pdfIn PDF document text
    • https://greenways.at/userfiles/file/petemenizumojojatuxan.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/dabegaxinifaxutavugax.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/witap.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160921935bd2bd---33733789737.pdfIn PDF document text
    • http://medica-brno.com/files/larewevudux.pdfIn PDF document text
    • http://ned.ru/uploads/files/2765215737.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/vopiperub.pdfIn PDF document text
    • http://deauville.ru/files/file/tudapatusak.pdfIn PDF document text
    • https://fallsplat.se/file/torixewa.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/16870961224.pdfIn PDF document text
    • http://minicabii.com/survey/userfiles/files/sukebukozow.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c22c03a0b79efe407ce15fdb91ed81a7/50534965849.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/nefijulujuwuzojufaxuti.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d593e69e42---kifonuwa.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609465110491a---64336230439.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/4384213569.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/xogulidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=comment+apprendre+anglais+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5C 19824 bytes
SHA-256: 770d112c42eb7dc4c5dbb2e1e36aeba16377435acef1e8b06373b5234f3a2ea4
font_01_sfnt_off00010d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D86 10872 bytes
SHA-256: 33e88d786fc3badd01b93308bc1ee21bf1672657146b2a439d360593d187e2fb
font_02_sfnt_off00012669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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