Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7cccdb1fbea451…

MALICIOUS

PDF

95.8 KB Created: 2021-07-02 03:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4da9033daa867d03d5c2f7a9052909d SHA-1: 546d23faea1131dac2513072d9417b67ac3f6e15 SHA-256: 8b7cccdb1fbea4512aa8689239ba4fa83951eebe1136946b6ea4bed29e0c9138
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host and distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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 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://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e9ac340fc---62524069379.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2f823a122---85647109484.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f1442c752b25a96205d12f4e5e7f8657/wigem.pdf
    • http://perles-del-beya.com/userfiles/file/46911932671.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/njk5flbg54iudhnjh5tmvvrp0k/sukikox.pdf
    • https://vicotelecom.vn/static/source/images/file/77991830466.pdf
    • http://alphasigmaoverseas.com/userfiles/file/36426712241.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/llvvfo01gsl0j6r8rv6ll8je4j/xujulenujogekideje.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/a4qb2ou1lk8dh6j77dqo6b7vt1/jajobe.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdd391254---77597789511.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ger104jrtimdr0agjqbk7ropod/4555960564.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/03a220e9f472567fbdd368871df43149/15788048193.pdf
    • http://waberry1969.com/clients/877040/File/26076539102.pdf
    • http://edanieltour.com/FileData/ckfinder/files/20210621_052A7630A58A97EA.pdf
    • https://rpitrade.com/ckfinder/userfiles/files/4110924198.pdf
    • http://nappsa.org/userfiles/file/wajuzeroxiwuxi.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/6lsqce75mrnlarilshr3retst6/48732931898.pdf
    • http://shiinamotors.com/js/upload/files/dajudizelirofizi.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3f4967f2f---jupawozazigekiwidusu.pdf
    • http://monkey-do.net/userfiles/file/35325046278.pdf
    • http://studiolaviano.it/userfiles/files/pefinobenim.pdf
    • http://ankamet.com/userfiles/file/82591493166.pdf
    • http://congtyvima.com/images/Download/ximuporejobuwozez.pdf
    • http://iziusb.com/userfiles//file/wunemitodurofunaragexox.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=songs+to+play+on+guitar+for+beginners
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb18.bin
2fd36c7b6e218dd8da044ae71efd940e27ad18a5cdfbe036d7296c499b51907b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 17940 bytes
font_01_sfnt_off00012a9a.bin
f9f2636f9fcfe7697936125ad29ab8eae149923e47e9cc0ba76efd095a27e072
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9A 10964 bytes
font_02_sfnt_off000143f9.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x143F9 16092 bytes
font_03_sfnt_off0001593e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1593E 16792 bytes