Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5bcc5a4b42bfc2f…

MALICIOUS

PDF

92.2 KB Created: 2021-06-17 19:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4a36d71b4b24e67b866b0b5a602654a7 SHA-1: 5619babb8baf084ff121a865c48c1398ff723b68 SHA-256: d5bcc5a4b42bfc2ff224de49b1447ead61f2a750ea540f1a9e0606064ab360c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The document body, though heavily obfuscated, contains text related to generating free Robux, indicating a likely phishing or scam lure. The presence of multiple PDF link farm heuristics and a high ML classifier score strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=generate+free+robux+apk PDF link annotation
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160749ac5ee2d0---69604624507.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/fab20c94b3175d7edd0394299dea9fd7/sawesudodakitifixetakole.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/ec339a664ed121cf9b33b9537e100cae/zivuxasosebi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/menonorisusinipepu.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/efgji2dcrer0hojblfq13b7kn0/79636513855.pdfIn PDF document text
    • http://dhf-china.com/d/files/58417863087.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b8f8ddaa---60865592659.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/zagipefoxofoligekebemi.pdfIn PDF document text
    • https://advik.net/userfiles/file/52862745618.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070477727969---3043617293.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/42953309311.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/gogovexevuge.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2f1f0187a---vexugezijewerakuvufer.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7aecacb39---31300940313.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804647c1939---74807664402.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB6 6440 bytes
SHA-256: ca853c5a932e00484aa44d4e49ac705709508d7ff1f63eec37c6b522eb4925b3
font_01_sfnt_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 4820 bytes
SHA-256: cc81602e9edb17c8a6bc7aa0315d98320be1566b9f0d090e7fb67ea1e4384b34
font_02_sfnt_off0000fe1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1A 7020 bytes
SHA-256: 2104465f54a2e9186c20f4c5b9bc18a9b9d7b45e1d41c8068277c1d82df63283
font_03_sfnt_off000116ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CE 11480 bytes
SHA-256: ade4ac054c16a4a666a3ac956ec32fc1f13388efb94f844640d617d322e46f71
font_04_sfnt_off00013dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC8 16804 bytes
SHA-256: 33323b6f6d55146d95a94c275ac6609e7be79ca9889a48f22eb93d9bb88cd634
font_05_sfnt_off00015454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15454 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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