Malicious PDF — malware analysis report

Static analysis result for SHA-256 b031568a415d1f25…

MALICIOUS

PDF

128.8 KB Created: 2021-07-15 23:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 926a6dfd9ae8c6023efe6924a2502ff1 SHA-1: 4283cad1627c57c5a24c6cdbc36b8d018f457096 SHA-256: b031568a415d1f25563a6d0bcafbf45baecf2a1a73be241ff14b946461d9c839
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The file's structure and URL patterns are consistent with a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=how+to+create+pdf+with+hyperlinks PDF link annotation
    • http://magnachip.cn/userfiles/file/20210525183148.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/rqbdftgsc7foqsb3khol3dmvia/50873947709.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/11e7jadtpo2fnldv4sg2iq66r8/moxemekupivexotufukeju.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8888af24d---48178404061.pdfIn PDF document text
    • https://lasanisports.com/files/pesopefanasewusemoliba.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/99078756805.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/vuzenaxomiradofapek.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/1ada092134550a39b3c16368f38da5c0/reweperusole.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/53717788623.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/54604222d2fb65d3cd04bcd1f63c0b08/71293153104.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d077202a61fd49e88f53221cdffc15cf/kuref.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbbcf48ba74---vulafuwalovoluzun.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/9qgmd7u04aa4upttts627egudv/bilotugunemekalirogefume.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-14/20210714123536943686.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160856a07d635b---bifexido.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/60406405158.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/xuxudelutonem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a69b7ebc2---4413289314.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7fce680533e1018079b278969faae036/30638408731.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/87798f573c5d0a19d42c374c645cea7a/54168137021.pdfIn PDF document text
    • https://bataretak.com/img/files/file/94493902985.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_off0001938b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1938B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001aba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABA2 11000 bytes
SHA-256: 2dc52838f510f47f22c12969e9310c01ef06312bac4c9df2eb10572a3a7b661c
font_02_sfnt_off0001c520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C520 17604 bytes
SHA-256: f50336da87bbf0e77faa1d93cf6a3457475b854ed3fcd60a1498532522982720

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