Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23916abe6d7034d…

MALICIOUS

PDF

84.3 KB Created: 2021-07-09 03:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 65507cd033ff355dca1de4d226e777d4 SHA-1: 56b104baf78730251bffc59bebe10308b51b8367 SHA-256: c23916abe6d7034d54275b46115c4c70ffbf99fdddeb2d7d0b1e3fb8cce00e44
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various compromised WordPress sites and potentially malicious URLs. The presence of embedded URLs and the structure of the PDF suggest it's designed to redirect users to external content, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nomylo.ru/uplcv?utm_term=quotes+about+supply+chain+management PDF link annotation
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4a4e15c0e---toluminozefagam.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/bivodadowubonolojojadid.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc87183f81---fidutimapexebajadafepigaj.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/9hhi3ul89fqps45pdga1mit2mn/75631412399.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083664cb15ed---63056634115.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad6159b8b0---57468728422.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14772aebf6---pufawi.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/tazutakilovojafitad.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a2b90fbc---jefakakunugalaxe.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/9375170186.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3f0c26c9---55871770815.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///94989139782.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/96824499377.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/nikupotejagadadukeniregi.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/88108166642.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079d3bdba466---95917113601.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608472ec247c7---52028629992.pdfPDF link annotation
    • http://ip-golubev.ru/ckfinder/userfiles/files/2435344747.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24fd5c4f9e---naxezoboxidud.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083328c114ea---76350125841.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/xujuwatakenitagudukox.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/metivodu.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4a9d44e4027873758a31fdcae6ec2d61/xabunoxon.pdfIn PDF document text
    • 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_off0000e801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE801 11132 bytes
SHA-256: 1cfb4adc88d9f969d85eb55712d58818db5d419526f1730013f28e3f26f202ca
font_01_sfnt_off000101bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BD 16400 bytes
SHA-256: 65ced1b8fae517eb5ce8da00c428d11a8d26d9c9d4befe1aacc5e294bf2c8548
font_02_sfnt_off00012c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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