Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3da3bf8b645b7b…

MALICIOUS

PDF

117.5 KB Created: 2021-06-30 08:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40ea8b0eafffa12bc2390d890698a262 SHA-1: 68fc0adc36b00a025b80e28d3343358ee04dba15 SHA-256: 8f3da3bf8b645b7bd0bf35cfbe7e736545e701279c882e3434c838d9820f1453
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of an advance-fee scam. It contains numerous links pointing to compromised WordPress sites, likely serving as a lure to download further malicious content. The document body is heavily obfuscated, preventing a detailed analysis of its specific scripting behavior, but the presence of external URIs and compromised CMS upload links strongly suggests it is designed to redirect users to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://synerhu.ru/uplcv?utm_term=nouns+ending+in+ist
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b039df610---wegekumoxab.pdf
    • http://aceranalitik.com/ckfinder/userfiles/files/tilafumabub.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef3a339d68---tigujekevodofax.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/99153005169.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/7gg4lhvsbl6901sbdth3rnt434/60093470006.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/mmjundf8acuuq9t23pdeje06m8/sirukupijaviki.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3030540cc---93322871904.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d672970f3c---12488477664.pdf
    • http://all-pass.com/folder/editor/file/73492298238.pdf
    • https://meccanicagambirasio.it/file/4058525782.pdf
    • http://zap-interactive.com/uploads/files/11929434102.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/12717d6a2d52f02af046d4965e6c7161/nomogifigika.pdf
    • http://ankurgroups.com/userfiles/file/pemujonitobodug.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/j24fm6ejjcedf166imo42736f0/49010862001.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afabf0052db---14033759694.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090875d43091---fozet.pdf
    • http://abwninemile.com/uploads/files/banafobudosurupix.pdf
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/xukazuxuja.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba045b258cf---2369905060.pdf
    • https://powermailer.in/userfiles/file/21939855604.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/51075934796.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096deb70fbf3---gaxenu.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/5593893b82c4cb1f2b462d6fc31b92d4/pipeki.pdf
    • http://jrpst.pl/userfiles/file/batorisabukuxalezelaliku.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/fiwopevifop.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/4963f9d4a5dfd6fa147384a58de47672/fovubitufifubolep.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_off00016ea5.bin
1e419ff53ac522c778c0f66d96c6bf14eb00f405953a1e51d9b44e984e48185b
pdf-font-stream PDF embedded font (sfnt) at offset 0x16EA5 16612 bytes
font_01_sfnt_off000199c9.bin
0bb1e333fd45ccf44dc35e229c83392fcffb0266b68879560b42643eba86862b
pdf-font-stream PDF embedded font (sfnt) at offset 0x199C9 10192 bytes
font_02_sfnt_off0001b08f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B08F 16792 bytes