Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1f23ffefc951b5…

MALICIOUS

PDF

72.6 KB Created: 2021-09-02 23:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c71739b0b5bb3dc0d3f24d823e245e27 SHA-1: e29a2a1058553bcdce320f2eb82e629a9d991bd9 SHA-256: 7d1f23ffefc951b599307898a8a3aaabd92f81010beacde1a4882e4896e10183
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the URLs and the 'link farm' heuristics point towards a multi-stage attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=metodo+critico+pdf PDF link annotation
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607648db80644---lapanibagazulosi.pdfIn PDF document text
    • http://feg.vn/uploads/files/47686788509.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/zoxewavafumujasibokokimi.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/35235848605.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/vitosasileloxojalonaduk.pdfIn PDF document text
    • https://noventa.cz/media/files/file/sanefa.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/zupitivosamilemuwidofoxij.pdfIn PDF document text
    • http://come2menorca.com/images/file/kotuwenofofagekubof.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/gumikugazagedegiwixilixu.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160802f52ba76f---dipukawokolamav.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/85674234148.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/08/19/file/fivovamufenisuwa.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/1174334237.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202187122451240.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/34109928643.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a2a9e6032---15054178322.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e48a1ff30d1---dupune.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/39878996681.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b39e8a03437---nuworomomoz.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/43973002809.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/88571140908.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/70327852965.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210613155439.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_off0000bd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5D 16172 bytes
SHA-256: 1c7a91744ead21a06aacaae20e9be8faa3415e9198e584501bfbf848be2c3a7e
font_01_sfnt_off0000e6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AC 10128 bytes
SHA-256: 21e9680f0713c7a8bed082b0f4805e1eeaa571bc97737a4ce10609cfd6f41d1b
font_02_sfnt_off0000fd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.