Malicious PDF — malware analysis report

Static analysis result for SHA-256 add118152cfc440a…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 22:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e181d62bf7a12f2d532a0f1428ad5f43 SHA-1: 9d6e24ea68c2173cd777da573f8874562bb2e467 SHA-256: add118152cfc440a0961f51d81d63838a1daf595796bbecd719e5241aa9ae8fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous external URLs, many hosted on compromised CMS uploads, suggesting an attempt to distribute phishing content or malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that these links are intended to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://garglob.ru/uplcv?utm_term=fun+android+games+2021
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d8018b079---41235079634.pdf
    • https://walnutcreekguide.com/wysiwygfiles/file/kekobunelumafalope.pdf
    • https://floridainvestment.cz/files/file/50407474364.pdf
    • https://brianhigbielaw.com/UserFiles/file/83803299986.pdf
    • http://plkorea77.com/ckupload/files/69645639432.pdf
    • https://glaskunstcentrum.nl/images/file/72138669583.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef45e0ae2c---fopufo.pdf
    • http://agama-rc.com/upload/files/kagofogij.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/cf71d5ba0b758a6f2ecaccd517bc23b3/86236288220.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/s2kjokib01ud04ri8r8o47m8b5/borabulalopipulaf.pdf
    • https://healthmatters.me/userfiles/file/48497387658.pdf
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/57775116281.pdf
    • https://techinnsrl.com/writable/public/userfiles/file/24396992981.pdf
    • http://flairpens.ru/uploads/files/pokej.pdf
    • http://fred-robin.com/ckfinder/userfiles/files/rabivarifilumapimozi.pdf
    • http://mdsalon.ru/img/lib/file/81211863908.pdf
    • https://ontogepszerviz.hu/editor_up/pizixasuma.pdf
    • http://xatrbio.com/userfiles/file/wipefigavupuxowozini.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/telojuni.pdf
    • https://haruhonpo.com/upload/haruhonpo/files/gawefozepaw.pdf
    • https://locoffice.ru/userfiles/file/bukepuzim.pdf
    • https://sieuviet.net/webroot/img/files/famiwatilakagonumonixak.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16137912310b23---rumememixilejupomuterewis.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/59bbc63181a9c6b6b3f7d02a0e1143a9/muwogixobedaguledufiriwok.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEA 16792 bytes
font_01_sfnt_off0000c801.bin
8decb00026b777cbf23420e8fd41723fe3294ca0c704ad778823676793b2ac42
pdf-font-stream PDF embedded font (sfnt) at offset 0xC801 10816 bytes
font_02_sfnt_off0000e0bf.bin
e94b99ab56d269cd4069f97d1a8b73335096372885f42dae34c3018f7f44b13b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BF 15988 bytes