Malicious PDF — malware analysis report

Static analysis result for SHA-256 99acd2b7a570929a…

MALICIOUS

PDF

76.5 KB Created: 2021-09-14 15:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fec257b088b3fb3d57861740a7506e00 SHA-1: 2963c7eac4ea96685a3fc7cec370fb9cc8985389 SHA-256: 99acd2b7a570929a65e5940d03be93804234f4b3f7d3158498aaf243cf0d91c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised websites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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
  • 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 https://hgb.se/filer/file/gapalibusa.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131560208288---86331846906.pdf
    • https://tour-paris-guide.com/cite_imgs/file/27359437412.pdf
    • http://cowmoo.org/ckfinder/userfiles/files/67227700102.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/7c6195b3ac9122ca24c564645d03f76e/73095441538.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a16d357cf2b1d514fe5f3f098f73f7a9/tujomoguvilokino.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613012142dfed---pafepoxerekujeweki.pdf
    • http://polenes.cl/userfiles/file/mabefilokukajabib.pdf
    • http://daltan.hu/userfiles/file/vewivevedib.pdf
    • http://amirafouad.com/uploaded_files/file/3748118334.pdf
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/23627101380.pdf
    • https://beta.nhatthiengroup.com/files/uploaded/files/fodekifipepipezelufijakif.pdf
    • http://saikunghouse.hk/userfiles/97028036857.pdf
    • https://promise-land.com/upload/file/18652507772.pdf
    • http://hoangminhceramics.com/app/webroot/uploads/files/89650776688.pdf
    • https://pensiuneavalentina.ro/app/webroot/file/darajoxononivugijolufema.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e69adac52a---girubigipijexenujuzukojut.pdf
    • http://nextgenship.net/upload/file/20210904163078761061.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c38f6b7e7bd8cbfa8a69ddc0b0725fa6/jiwafosuxeja.pdf
    • http://circolosilverblufitnessclub.eu/userfiles/files/gudidupatedilas.pdf
    • http://qianlong99.org/ckfinder/userfiles/files/mejaroturowed.pdf
    • http://bestpokeya.com/uploads/files/kikolojibasigefi.pdf
    • http://ms-krmelin.cz/app/webroot/files/files/78839224802.pdf
    • http://sziazsauto.com/uploads/files/36776866440.pdf
    • http://virtualcharityevents.com/vce_cake/files/files/pokorosoweda.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=most+populous+continents
    • 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_off0000caa1.bin
0c80e191c2664370efd6e38618a3d7ae29d7cad945ff4112c7dce67e9226ee1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA1 16848 bytes
font_01_sfnt_off0000f5b6.bin
643a05489c169a96c4c1243b35d1a53b41ce6d675434754b42317a1c94e37138
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 10196 bytes
font_02_sfnt_off00010cbd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBD 16792 bytes