Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d95f1ec79d771b…

MALICIOUS

PDF

91.4 KB Created: 2021-06-27 10:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fd71ea22c4f0fab7e4bff78444a3167 SHA-1: 807e8f928333dabcd799c5482f81d6284183ec32 SHA-256: b5d95f1ec79d771b565d3b179cf06231d5c6d61b97e7251d01a67a55d4522db3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to potentially malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support its malicious nature. The primary attack pattern appears to be leveraging these links for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=causes+of+deforestation+in+tropical+rainforests
    • http://yorktownhs1987.com/clients/57482/File/gozaba.pdf
    • http://rubensova16.cz/files/file/bunudalusevaz.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7611bd5774---gogagonodejefekuwisexa.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0b53447fa73f216474512c8703230a80/25946257864.pdf
    • http://abc-tel.ru/data/File/38837891719.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/ba90a3b285367fd09b5db8b76e9ade1b/73258751546.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0553563d45086a19c94bf1e1f49c4412/guxuwesewigepu.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/38afe3b852dfc432eda460b3b685035d/sesuxeba.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/9ccd1e0a3b7bf3afff8aa38806eb74c9/tororejoposuxipem.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ft23e7qi8h6e5cn526hemg1ht4/wegigitosidojukerogipotoj.pdf
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/24497136658.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae78b168be---duveruvos.pdf
    • https://pabrikangka.com/contents//files/vafagimenokusiroxo.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/2e6e3fde5f8a895a832f2544342aaea8/29041759593.pdf
    • http://studiorinaldibedin.eu/userfiles/files/bavitewizusup.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/pgb1kpi19o6gfnk73tcn4jmcgf/sipeberutiza.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/dmuvpgqmneloesr8g3n1j9hsgd/66062946586.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/7a28141b4a0dbb596aa2893ac472569a/89571119673.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b43b2be8bce---73432920563.pdf
    • http://mt-filtration.com/uploaded/file/154746475960d1d46d18f44.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/e64poiqmrv0p4pper86ftma30d/65665096394.pdf
    • http://vimbark.sk/editor_uploads/files/xilusujix.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//75764504558.pdf
    • http://bajajsports.com/userfiles/file/jiwuboxib.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/73fd32240b2478a5103bba6d9b22b356/jisopadezobawejum.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_off0001031d.bin
85b8f57b921be21a54b02a33a9fa3ba9cfcc757d676698e1ac634771479b1aba
pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 16804 bytes
font_01_sfnt_off00012eeb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEB 16792 bytes
font_02_sfnt_off00014702.bin
481bbf50582e8dfece73ec2e71e02963afd406b9913163a6c84a013a85659abc
pdf-font-stream PDF embedded font (sfnt) at offset 0x14702 10744 bytes