Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b955889606c062…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 13:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8a7b9e03488579b50b2abfe3fd6f3323 SHA-1: 11056101d261fe96cb529e0300180443ae05b9f9 SHA-256: 93b955889606c062dd0b225b7fdb73201b89b97ee7144928f33dca26ee64de42
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=euphoria+season+1+episode+1+putlocker PDF link annotation
    • http://pyramidplaster.com/file_media/file_image/file/60347871145.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/96982391742.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/65957384330.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131d2eb651c9---76459881531.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/30244ba2577620be255c8007c556811c/94564145439.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/69342600480.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/rosogoradujebupo.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-1/20210901110834515231.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/kulesizefirebemekosuto.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/58552649830.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1632079641_d84aac3d94.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/8979214925.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210908_065334.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613205a2ab7c2---lejufopugamubaz.pdfIn PDF document text
    • https://mar3ol.com/Files/files/rateramulon.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/vofosuxisorodekipobore.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7bc07daf5---wexekidivomaxumivowajekoz.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a707540a2---lokamap.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/tuxugovejevoduxud.pdfIn PDF document text
    • http://sdes.in/uploads/joresimadelofowiguwej.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613773e347293---silebaxixoz.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/l926jnhffd7plnnaoga34e3sk7/58231274394.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_off0000d440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD440 17876 bytes
SHA-256: a6de7d280637b6ceac63593807f9fd61a111f24b38658b696f7db54e14c5c948
font_01_sfnt_off00010201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10201 10836 bytes
SHA-256: a37aceb0d64adc1622573252fc0df890b3f982e2adc14ca3b156e917c173da8a
font_02_sfnt_off00011b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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