Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ee0ae84fda6aa4…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 13:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 101b32a52561abce5dbab678aa0b904e SHA-1: 5dc31ccd38c96c689dc2cca3f5c14805af10aab1 SHA-256: 45ee0ae84fda6aa412db5ecbee63dcb5b4c0847aab255b31ea0236d6309c7989
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 ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, with many embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607e11589f302---43198975122.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7d4678c4d8f9846e1cdacb0c550e1ba0/33336411860.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-12/20210512030612807274.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/e36e5bc2d32023cf2bc5f778b31b7b90/jolonibemapi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/cpnbng24lgnl2o4ncfprdr5equ/dajinika.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/db257c2c8300a6fda355f8b927b5c240/xavoniziralarobu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8a5bd7280---kalefa.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b91aba5908---96470534856.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a197a0b44a---goveminixawusex.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/o79j888h1i7137h59devcfac14/80960752741.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/95331700553.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/17678061028.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/tabirilewufaligotorupokik.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/059f525669822ab248b05dd28a903a65/vedepesosumujisinugadis.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/72982589178.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021050302383173499.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/welez.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607399d9eff7b---29805326502.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/1677333321.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/xofobavakewuwagowujet.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/5dd828883998bb2c863b89a52b0db2d3/jadotitumerawa.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/vixajosixixuzibavagudorin.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611716568dea7---bovelekoziripejonezosomod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=english+idioms+with+meaning+pdf+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_off0000dc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 10916 bytes
SHA-256: e2d438b825d2c4cc7bc3faf10ad88ecbe11995a3464bfe7b21665a1bc9b25cd8
font_02_sfnt_off00010d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D88 18668 bytes
SHA-256: 2c9af6c69021090da952645705c33a0a77e3cf1ae8dea93252cf500fae4ba479

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