Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2e9109cf8b3169…

MALICIOUS

PDF

86.5 KB Created: 2021-07-06 21:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5ca13f2342fc33798fbfbf568abcf7ba SHA-1: 8e5b80ba811f6610384790dcb65e0bc61cf1a0fa SHA-256: ab2e9109cf8b3169af3e8d28b335e6ed91999fb1dc265f5318bbe61feffaaf14
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs pointing to compromised websites, some of which are hosted on disposable domains or utilize WordPress upload vulnerabilities. The primary purpose appears to be directing users to these compromised sites, likely as part of a phishing campaign or to serve further malicious content.

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://smidgel.ru/uplcv?utm_term=twinkling+of+an+eye+in+the+bible PDF link annotation
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/kp29ki84bahngf1776q6u1dfj7/sogekene.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3b097676a---totowibok.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/masariwupepuwuz.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/b5u3o32nmi5aq6cfgmv3lieg5d/renuzugijudubowojozuf.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/48393821595.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b333345c42---92091348065.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/62930845824.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bd65b455b---95285236102.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/togadizaluko.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/83c7208cf3123d27817f92ab20385482/19191906814.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/f92d89c8fcc892e4dad276ba33dff463/58772705597.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b35ec66ba---4735179335.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddb622dc8c---6054610030.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/50631179495.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/34584688345.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/ar5j8f4qql0tqkncj5olbb4dk7/87638790718.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/vozibawakarikikobo.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/17232554540.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/44742481490.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608197999b918---wumasumotusorabetezega.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000ed5c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xED5C 18268 bytes
SHA-256: dd865afa865f83c4e2597070b114a79fea7cabd195b136a4876a1b605ff87067
font_00_sfnt_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 10620 bytes
SHA-256: 54984ced686bd801c7853c07ab5acdde9ed8c8f8f20b0fdb5649721670bcf933
font_02_sfnt_off00010a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12275 16312 bytes
SHA-256: 26558a01aa3dd15fff2e048af6733f932761956c06e5670dcb2b9e9732a0ae85

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