Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15665ee9d6f9b71…

MALICIOUS

PDF

73.4 KB Created: 2021-09-08 07:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0828ec1afbb9cdd80520a564ae015d5a SHA-1: 14b32210303bc87c3315e44789776aa8a02a18da SHA-256: d15665ee9d6f9b71c6a4a0b425290745d7ac40938f3a32e354db2762abb68b52
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 URIs and links to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics suggest the primary goal is to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=linear+optimal+control+burl+pdf PDF link annotation
    • https://latrinquette.com/upload/editor/file/87764284000.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/1684d09e31af2ce2a141a4bbff1e1a0b/zavapazubaforogitama.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7dfbb672d---20924821754.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/fowubimazedojurulo.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jizuvisitubowanixataxepi.pdfIn PDF document text
    • http://www.puhito.hu/uploads/40397928442.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/50737414965.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e982ed26133---xezuninubigaxupo.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210727_050914.pdfIn PDF document text
    • http://dytac.hk/userfiles/11931191651.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/zekup.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/vopamesekivubo.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/95468034428.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137eba5f1402---sotokutemij.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fb1caac01---remorotimet.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/38561044426.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/jenipojorezav.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/tulinofif.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16098eeafc3780---52516347364.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/dozuzemenilibejevuwe.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/42454745722.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbde24e959---37366693455.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/1b7f4a38fcff672ad4525005a448e655/70900385246.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/82279953086.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/61672713752.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/658655347.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_off0000bbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CB 10812 bytes
SHA-256: 786d115c7be0a9a3852db2f44628a93f2e91fd5a6f99cfa78ffeecd85ce22046
font_02_sfnt_off0000ec65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 16636 bytes
SHA-256: 8cad87db74a5a100fa99cf972fe2c2456f414a97f5bb4ed5cb49f14e87918187

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