Malicious PDF — malware analysis report

Static analysis result for SHA-256 46bd6bd2eb4c0c63…

MALICIOUS

PDF

147.2 KB Created: 2021-08-09 19:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7697685e8275ab9640b9174b5badb5ae SHA-1: deb08a44f85efdb171586f4c56107a4b5f37e0eb SHA-256: 46bd6bd2eb4c0c631118fd12f6f6f96f37d8b3968d24470939aab41204b8c9d7
244 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and links to external URLs, some of which are hosted on compromised or disposable domains, indicating a malicious intent to deliver a payload. The presence of a 'Password-protected archive lure' heuristic suggests the document is designed to trick users into providing a password, likely to decrypt a secondary malicious file. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://nhuaduongnhapkhauaz.org/upload/files/mowefonanezalufovikipo.pdf In PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/9c2b9742f0d9188ee311ec51dd43f8a0/23551508686.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609257722b803---rewaguvilebelupoj.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b831b2975e---dujafag.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/62828615268.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7ebd0cd91---94437156904.pdfIn PDF document text
    • http://langmypham.com/luutru/files/kekosuwavaruwigekelifulol.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097e41ebd8be---97905506822.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e8fbc1a5d80da152988c47a42ec6e084/lipetavuvur.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/likowukipusazopibak.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e56a946d81c---xujevunozejebawagatot.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/budebetotetewiletovalo.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/divug.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/28182378091.pdfIn PDF document text
    • http://greenreunion.org/clients/f/fd/fd69eab1634eeea6368acebbe5d5cb0d/File/nenexonepewezum.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b1df3d2bdb0---93874059484.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088dd605c447---gojebonagisexowuxuwaka.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/95134602612.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/75e4e9e3ffa2b3bced8fee9709832daf/pinuwopuworobedarine.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b525ff8a5a6---28274346885.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/6cb51d2cf90e55dbdad06b2e6e1fb2e0/90625355935.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/37447820419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=janeway%27s+immunobiology+8th+edition+pdf+free+downloadPDF 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_off0001d7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7C1 18948 bytes
SHA-256: d6df9c59bd7e0f22c2ab618579bd4f47bcef8c9dff5e0414dfd3061b3c339bec
font_01_sfnt_off0002094e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2094E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22165 11620 bytes
SHA-256: 44b12458144a32ca9da9e524963702d81558abffe878c1c6244cbc972072f2ef

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