Malicious PDF — malware analysis report

Static analysis result for SHA-256 4497621ca339cf83…

MALICIOUS

PDF

104.8 KB Created: 2021-09-17 16:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: baf9fba580f34e83aa1e4e0613fc470a SHA-1: b8a9521219f3fff5a95171d1dd4b18dad5101f2b SHA-256: 4497621ca339cf833c859cb09e8c482d6d89bebe02905269b189ed48918514e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9618

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://pixomot.ru/uplcv?utm_term=fifty+shades+darker+tamilrockers PDF link annotation
    • https://kokomanis.com/contents/files/zugezeka.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136349dd5c2f---xujadufilesekozogavi.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea66a528e1---varimaveremoz.pdfIn PDF document text
    • https://limsurempat.com/contents/files/xizimefiwefobonekavala.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/70304072279.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/bomovelog.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/94731544854.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/65597408554.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/63459076056.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/54327143087.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/16d6583d6cd50dfa28a58d2c4e88dd58/57136195673.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/73469175228.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/91697471732.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/lejufazuxawaxarofigedasiw.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/pevabejinenexiwivana.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/38ee058950e9969cb9f62413869558b8/56553793463.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/zunebufo.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/66608447019.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/59408206420.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/45151794438.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090918441856427.pdfIn PDF document text
    • https://vpmemorial.net/images/file/verasolofeketixe.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///27227574727.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1efc85d3c---dopodizogazemaliziz.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/lonagozokudididok.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/a0gqo3gkkg5g5h93v7b1dv0o505ffidb/voxipeb.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F3 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_01_sfnt_off00012c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C94 21816 bytes
SHA-256: c08054573c2ca981ce6e0c12687bc88ef075a74218ed03b8a161ed5794dc9eee
font_02_sfnt_off000163af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163AF 10820 bytes
SHA-256: 888df66a01693c61f031d3ed87c8ce89e0cf5c8475818ba40fbc1bbb65e434ac
font_03_sfnt_off00017cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1