Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9261c690e7f50b…

MALICIOUS

PDF

84.0 KB Created: 2021-09-19 03:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e87974b754e21793643a1d7b370fdc6 SHA-1: 153f95e6d13c2390be58f3cc75c091510bb0d7aa SHA-256: 0e9261c690e7f50ba771e1279e772dcc81c8482b95cafd08da6e9160bbb7c5ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://allytemp.ru/uplcv?utm_term=arch+linux+on+android+phone PDF link annotation
    • http://mtkshop.com/images/uploads/file/zukapidananonag.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/lofawozexizilefojisu.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/73727795653.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/460dbc44133f41cd2f5fd03746cbeb7c/21599101883.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/68037390229.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614680e67d6bc---pofexopozagu.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/fusiwugapi.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/vimejerodutikuv.pdfIn PDF document text
    • https://onecre.com/images/content/files/foriboxiwakeduge.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/4921311376.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/mosojesujogetabagew.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/mapidezisozo.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/xaviworenigofibiba.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/21066125505.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/1163367659.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/6rpuj9mmp9toaipk3p5n6utlc2/jivikabumazugemixekemur.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/22427966319.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/zaxajisijipeme.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140c9fa07deb---55146094155.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465ecc1965d---13898153617.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/nezoxi.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161451e5aaf2f3---gigazodemowupisageraf.pdfIn PDF document text
    • 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_off0000e4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 17620 bytes
SHA-256: 1dfeaf00c7353ffe93c3bf692f53bb5dd61098a0f6368306346eeae516157784
font_01_sfnt_off00011304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1B 10528 bytes
SHA-256: 23b8071d34f786a99fc607a7f2bcebe62c21094a8aeb3f9bdf71d080616c32e5

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