Malicious PDF — malware analysis report

Static analysis result for SHA-256 c888b779ebe4b01d…

MALICIOUS

PDF

87.7 KB Created: 2021-08-08 11:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8313358b0a3219920e1789c7b00f2d62 SHA-1: 32f6ba314e91a16d7034b00dffbcbe28b5bbb13e SHA-256: c888b779ebe4b01dc1983fa4ccbd8f8bc2aaff5be4fdfaa381403f95ed452b4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous URLs that form a link farm, likely intended to redirect users to phishing sites or download further malicious content. The presence of embedded JavaScript (PDF_JS) indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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://philabc.ru/uplcv?utm_term=food+chain+gizmo+answer+key+free PDF link annotation
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/31cdfad662f1b8e64a5e485a0ef9b28b/96848567885.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/garuguvuterudew.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/xanolexadexe.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/gt37q9ifpu3e8t9o9908s7ocj2/78296070300.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fc4156c13e2---60056634927.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872eed56064---dudemu.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/77924093662.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/ba59345569c1d6c3a6e48e9ec58f20bf/48804918227.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/zexuxonuwoserip.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/sikaruwoxiritopinikawi.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/sisuwubeseni.pdfIn PDF document text
    • https://rcot.org/userfiles/file/remenuguvixupufi.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/35in5g102obscotjsehsemfua0/38992665301.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/jdam3ltr8lr9k5uv74iuj4lf4d/polukavukawevizitu.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/pawonerenuwuzuzisidomodat.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/lanaduvagumobulopo.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/gixemaz.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/marujok.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/wukibifoxetotixe.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///pitavipobota.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac92b0da108---39561433816.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/d7648828024bdef36ee3beda1c7b26af/damolagek.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805df16a581---5389249799.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
font_00_sfnt_off0000da8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8A 16212 bytes
SHA-256: 87088d3577d9d050c4a7591e7606cd6c33fab7e0b2ac80593eae1a57c5dc7e17
font_01_sfnt_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 17752 bytes
SHA-256: ce120db88772e85b4d2a0e190773fc5a2123fd533b45623a15997633d35b3906
font_02_sfnt_off00011e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7C 11108 bytes
SHA-256: 773388fb4f9ce3e819b1f683c42ecffc298196a14be275e272b7375677ed0410
font_03_sfnt_off00013815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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