Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3b39f90d87c73b…

MALICIOUS

PDF

73.7 KB Created: 2021-09-04 01:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f851f010249446afdb05dd3365c121c SHA-1: b7a6ddc8d79721501d597e1c50871176cde7e4eb SHA-256: dc3b39f90d87c73bf224f75776d17dcad54fb4c691e42cac44ee02efa940f82d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=receptores+sensoriais+da+pele+pdf PDF link annotation
    • https://nusantarabet4d1.com/contents/files/51441948471.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/midaludojujero.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/c6a0c39383a14d8d52dd790d968cd8bc/40480628075.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608670241508b---57234990685.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16082e038495b1---47084134186.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210816090205.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4aa6e712ad60d17851c2fb775c08d3ec/93085454775.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/dopegibaligupuguvefoximud.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f86a88faa---63359285329.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bc8f8da18---jurupugodutevaxijibusag.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0f0a8eb7d---muwabo.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/jnb4srcqrk7frf8hpmvecbpbq2/39912885784.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/78572735342.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/12709678870.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/7c68159f9d8195dad49a201b50345ef4/tabazegupulave.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/fanovojobev.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/2ee2f0424e745f830cd3fd478d9eb373/nofodulugun.pdfIn PDF document text
    • http://cl-pub.com/files/files/79174726574.pdfIn PDF document text
    • https://tepihtrava.rs//files/10446293260.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611d2f191ce04---48879129647.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/6dc0658ff95883848c413d244a3c777f/serukidazufuju.pdfIn PDF document text
    • http://swotaweb.org/img/upload/file/29208702059.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/92055568593.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/76335139483.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/154361cc02b626510ac5fb37f110be69/siwagolipema.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_off0000bcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCEC 17432 bytes
SHA-256: 85810121652e8265fecf96398d6650b45f6a6d50079dc65984fea9d78740fa04
font_01_sfnt_off0000e6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CF 10660 bytes
SHA-256: ca58039da3aa4bbadeb96c1339fd1c804952ac0d8da5a7f6392248437dba5ee8
font_02_sfnt_off0000ff56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1