Malicious PDF — malware analysis report

Static analysis result for SHA-256 720aac44c941d407…

MALICIOUS

PDF

87.9 KB Created: 2021-07-04 16:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cd2d6674962924e4b74e5c193c517549 SHA-1: 95d6130d4cf0ea75d2b3102a1597fdc307c08990 SHA-256: 720aac44c941d407e2213db26237e452cf1a138ddfac12cd8a50a5d878183789
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations. The heuristic 'SE_INVOICE_LURE' suggests the document's content is designed to trick the user into clicking these links, likely to download a second-stage payload. While no scripts were explicitly extracted, the nature of the links and the detection by ClamAV as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://inwebjor.ru/uplcv?utm_term=extraction+bruce+willis PDF link annotation
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/c2lbmqs35o1go02st6ehrij3fu/61212038555.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4808eafa1---55675561765.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071c63edffb1---pobezudized.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/witugap.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/b595ee15e3b53ca8f5e49c0147e2246d/16012698792.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082239f6c3a0---xeboverejexifozugere.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921eab5de30---tarumenopodu.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607927470e3cb---jarizof.pdfIn PDF document text
    • http://teplospectr.ru/images/files/teratajulabodupanax.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/71191109660.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/gofitot.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/9a0bfc53d91184ce68ca9acafb1027ae/97481128057.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/37654532176.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/j8buavctujue4ibd4cnht0b4tv/40576599558.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210619082510.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/jabogapiveluwuno.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff53596723---90423096363.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/zexawoxena.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef97900fb6---33565010717.pdfIn PDF document text
    • http://albesiaboutique.com/files/upload/files/wofudikanosiluk.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/c80350f095bbda09d91e4629a408681a/korosusajajubexep.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/16130084500.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/291358599165.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab9597f7bf---65335029442.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ucgvnfb78ett1n5isucdrshqcd/sufijoratusifebegamus.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/vuxozubekuledidulugafijo.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_off0000f0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 18192 bytes
SHA-256: a1d3a3949b55838eabc19dd371ed8c304e2b982b3fcfc90f5e143483e81c8586
font_02_sfnt_off0001383c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383C 10632 bytes
SHA-256: 20aa693eba2d3dba995ab2d3f4f414feb21d7ebf42965afe5c2c71d22ce73bd6

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