Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a39b97c63407dde…

MALICIOUS

PDF

94.1 KB Created: 2021-08-08 13:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f602ce81353360e80239ba9c720453b4 SHA-1: 8f52fa4709f1ed97de570569e71066257e043e58 SHA-256: 7a39b97c63407dde0ccaf1d48d7af8d86f2ec8cc7921c439f69062e3bced9c2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://pistant.ru/uplcv?utm_term=batata+doce+cozida+com+casca+tabela+nutricional PDF link annotation
    • http://aj-logistics.com/stock/userfiles/file/tinaxoteg.pdfIn PDF document text
    • http://goref.ru/files/file/wibedipapa.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/5571589548.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/cfb470a1bb7f225d2aaf93723a2156b9/10453495204.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/f6830b1114d9dc273db56e96fabf246f/49689546400.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2273bf8ad---88603874436.pdfIn PDF document text
    • http://prosquash.by/data/15634031212.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f42297babd---66039962538.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/n3n8lkbfsjtias23i8eqb1p1s3/gebunox.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f60fe30dd---xivinumif.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/wawavategozofavisuka.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/renureguzuvereteriw.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/qersd1ov81i9lbbs8s0lelc1j7/berilopifo.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/4137634bd2a67aec1506c8c8b71826aa/95736693620.pdfIn PDF document text
    • https://w4gw.com/file/76333559166.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acba5cb3cb0---50398758597.pdfIn PDF document text
    • http://frappsreagent.com/upload/files/dufax.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/79882069072.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/dibunodom.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/8667307862.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/ronukirajukezozaxutimifir.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/4534755321.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fea7985bac319aa7e4e46ad103891b40/rewojorojexababoxabope.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/musevukufenagivobudevi.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/riwozafemotomixusateti.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/42711954332.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_off000106e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E6 10884 bytes
SHA-256: 6661af1a93113f89098465675253d1ef1e5a2f26c32141498ea79ff7ec7b2a3c
font_01_sfnt_off00012015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13827 19024 bytes
SHA-256: 969bc0715550211f61d9c6f8e8ca3f6c6fc4679444ff96063cb54c0f55948b99