Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe78a079c2c040f…

MALICIOUS

PDF

70.9 KB Created: 2021-09-22 16:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d785c5c5380940a26c952e785bc6e763 SHA-1: 5b0b389ad24918a53aad8f6c2e102f4400820ecc SHA-256: 1fe78a079c2c040faef0c60d9217568198a8a6d742a414cd453c6fb2605f1dc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous external URIs pointing to potentially compromised websites. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=2+3+4+player+mini+games+similar+games PDF link annotation
    • http://jayeonrak.com/upfile_editor/2021/files/34253734708.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/96299707048.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/xofajug.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/91190299403.pdfIn PDF document text
    • https://ebooksweb.net/files/file/wolezadog.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/27vh3m98715megdc725o02ogt3/32339804450.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/kepesazifanibikene.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/32485667990.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/61799476818.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/bezuvibuwubibekomof.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d363c7000c---30008380364.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/72549003853.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/19487325806.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/mapotisudokelu.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/23173743323.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/41792647227.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/87f5aae4c8bc5845546e36c773cd2c7c/65977756026.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/lajonujopujig.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/geturago.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/31296603573.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136716456cf8---dogomazeledobive.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/40296670135.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/lozulagonek.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/5957554241.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_off0000b611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB611 10764 bytes
SHA-256: 455eea261775ed3dd40fa5a96ba3c9cbc1edd5b900911b939e6ee022f454e100
font_01_sfnt_off0000ced4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED4 15128 bytes
SHA-256: 1d7e747341189ab9b86f6f5850e0d0e423340ccb8e40a6e95b07e1ac37eb32f2
font_02_sfnt_off0000f52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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