Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0de68957be5e37d…

MALICIOUS

PDF

77.7 KB Created: 2021-08-22 06:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 97dac14931bcf47e75b65025bd5a4679 SHA-1: 9deb723a2eab9748f16f6e85a6f39d2cb05f6aca SHA-256: a0de68957be5e37d57858f634e439364813a5d38c1a226e7f3f0265d5e9ed4e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it's designed to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://infrive.ru/uplcv?utm_term=youtube+challakere+brothers+rudram PDF link annotation
    • http://kalmi.ru/upfiles/files/28616194649.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080909043adf---17272342041.pdfIn PDF document text
    • https://orangerun.re/photo/files/71689835708.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/cda4e1c787b75c87a163230a5bf75c3b/kejupadim.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2c4a647ba---12229747013.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eededa4b0---26777519021.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/63003194217.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/b106qqg4e7smob7qau2c37q62k/pazokoporiv.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/beduxijojiwuj.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa29c46db1---zadijejenepaguw.pdfIn PDF document text
    • https://combrooncom.com/contents//files/kizugujubowebikakafu.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210812144308.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/30641813110.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16089e5cf5f3d5---66937682644.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08d463d884---peziwupore.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b486cc26b8c---votavururapawawitewifibe.pdfIn PDF document text
    • http://africareview.in/userfiles/file/xatulufolunek.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/7sjs7pr3gv1n0jvg4qndvhk8oo/lixasuvoli.pdfIn PDF document text
    • http://dewalt-naradi.cz/media/upload/editor/file/89473013764.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210704023242.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7df43397ac---sivuzeduzixij.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4344154fef---fibevazozejosomotamore.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/sexano.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17015705788.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/pufug.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/zukuduvupabisita.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_off0000c9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A1 10752 bytes
SHA-256: c92c05f47bb57370064b13d8c312eb317be5ffe80adb702a0bd47ce9ceb9c068
font_01_sfnt_off0000e26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7F 17604 bytes
SHA-256: d5845a3d5b23dace2d64943ec5efe7600e37f7719edbec107b08678d2c99136c