Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b21c1f5a6604b1…

MALICIOUS

PDF

75.3 KB Created: 2021-07-03 20:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 38e1f0b9c0b934a1498bcfcb89eb5a93 SHA-1: 18032a39a8b9597b71f336a04c8c9c7cf7700485 SHA-256: 99b21c1f5a6604b17d964c4b9825b822ae9583ad83682b05e3a47e2cc05305e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by both ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac15e5477c---zugakukisowugoxejokeba.pdf In PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761ed876086---41678720404.pdfIn PDF document text
    • http://elitvorota.ru/f/file/95283387372.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/kafosonunumodawep.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/52955294725.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/lumop.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c89add1dbf---75367058046.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/53890127337.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079229b05da7---damivupikoxixelam.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/63488171357.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/jovibabogubomaxar.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/21483208754.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/d698c3220cd4626c7ed9ae467bcc5602/72811044236.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/de092bab2533108be4fb2bdf0451e7ff/vonunotobegewukemiv.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773d86f0d65---64541708576.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b446d06aead---15039865167.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080523cd4250---79834970220.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/247248a968e0f9a4588662578118b0c5/pajubisitakeduzov.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609948dc22a52---fujinadutubusigiken.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/hk1fetcep6b4dshqlujn5d1ne1/67426107275.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/6125525819.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/sobasovef.pdfIn PDF document text
    • http://novichiha.ru/pic/file/91470836692.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/roruwaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=two+people+riding+one+bikePDF 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_off0000c6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EB 10420 bytes
SHA-256: cd17cf10860431d621d5a4fef2cfd878a6dd096a5b001e184130eadb0cceb2fd
font_01_sfnt_off0000de25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE25 16284 bytes
SHA-256: c7a02f2c2ab4e6ea3d201c3edd6a5919eb014026ff774f3ed2634cdd62dac4d0
font_02_sfnt_off00010804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1