Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12e05236947fc94…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 19:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4a2a124d3705019b38f2ef0745f600b4 SHA-1: cb6cb26131ff5877c10d03e9f96a05ddc44b373e SHA-256: c12e05236947fc94f5bb31e7d06f69e07c73a19f4c511994f7d2246e697f9bf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting or compromised WordPress sites, forming a link farm. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=group+messaging+not+working+android PDF link annotation
    • http://eapver.com/upload/ckimg/files/202109111010456191.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5102e8218---60629663732.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/nesapakojeloba.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/70847858555.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/ruvezoxetivow.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341aa786cec---95236666237.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131d7e165661---13201461670.pdfIn PDF document text
    • http://skupka23.ru/upload/m/83543695229.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/zovazizijupajen.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614103c2c85a7---68563978460.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/sopusap.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/7386046394.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/dewifidaviwit.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/wulesefotukigilisirekuva.pdfIn PDF document text
    • https://terracell.pt/images/file/63356608307.pdfIn PDF document text
    • https://websbag.com/uploads/files/91764286999.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/81605433498.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137641cda2fe---31241159379.pdfIn PDF document text
    • https://dukupahit.com/contents/files/nuwakadaruxusujojalad.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/24760399728.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/kipikexarorika.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/malugeguxizupimavuge.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/witabewufipakemi.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/57125205467.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_off0000cc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 16388 bytes
SHA-256: 38cee517724eb752ed41d799844651af0d7f5c01b787d9c6d0280616febcf2f1
font_02_sfnt_off00010e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E71 11008 bytes
SHA-256: a7873e15779073dc861bd39c98109091bc737a33bde11850adfe8910a495e7ee

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