Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9b8565dd5f026e…

MALICIOUS

PDF

74.7 KB Created: 2021-09-16 11:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aede62b286acf1adecdc8ea9029be845 SHA-1: d3ab7523184eaf1eb99e75343d6dab0afae024dd SHA-256: 5d9b8565dd5f026e5f1df4ab2523b1bd8ec7f73b2b2ce27b084b66ede8ede0d1
184 Risk Score

Malware Insights

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

This PDF sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a 'download' button lure further supports the attack pattern of tricking users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://abwlanham.com/uploads/files/82119019796.pdf In PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140659361987---wotivegu.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/dezajiduxodirad.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/sogumesisuvazobarele.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/87865808181.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/zobevijerasobebug.pdfIn PDF document text
    • http://meta-min.com/files/17968975718.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210907100441.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/78153188597.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/030617252981.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/newidasejurifuxor.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/lidakej.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/guradok.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/rokerisuxevividi.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/71166531850.pdfIn PDF document text
    • http://stylekd.ru/files/saviwezidusavonap.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/letulokemelujerabuna.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/4osueo7b6vr1ukrgfdrbg7lrgb/zixojuredixipaf.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/mixoxalomedobamigug.pdfPDF link annotation
    • https://matao.ro/app/webroot/files/userfiles/files/tajuvozalozu.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/debominewekufifaxuxe.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c6bf9c4cc---73334190543.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/6a0aa0829e3219942a6d4a01c278ce26/81411170111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=download+stick+cricket+super+leaguePDF 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_off0000c119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC119 16396 bytes
SHA-256: f90e667a7869950bccead9c377eb1fdb5f32a5e29e8229f816e3bc0d6f723349
font_01_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 10968 bytes
SHA-256: cd8ad24fb8c5964e0ef8e10f06c8e12cc53a609a106235570e2820dbb6d0ce46
font_02_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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