Malicious PDF — malware analysis report

Static analysis result for SHA-256 285a0f3e16304dbf…

MALICIOUS

PDF

99.6 KB Created: 2021-08-29 17:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 519f4501821138da2b7a65181904d110 SHA-1: d5be7387bcee90eb303a46faa01415776a2ac811 SHA-256: 285a0f3e16304dbf4bbeabace356a72f30391b05325b94a15fd497f175509914
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to host malicious content or facilitate further infection. The presence of multiple links on disposable or compromised hosting suggests an attempt to distribute malware or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec54d67d5a---27680048199.pdf In PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb208544fa2---85381760663.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/81565925820.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a823f0c5b---68634279272.pdfIn PDF document text
    • http://recrute.fr/files/files/19544064468.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/pipuxuravamanusifo.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xigitugunud.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877d740e8b6---purimawi.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/raxapivugibinovazabut.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef5b0b6c1---5632091718.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/99967189650.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/7cf9fe52e779d7b31ef6d201b6371ced/53319878281.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bd74cde42---lasulubupa.pdfIn PDF document text
    • https://akemi.ro/hirek/file/debevemif.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/99732572990.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/rogexikubudefizoramifosu.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/12652138360.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/nepelorikuzodudi.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/hkovg0gkvpejs7i8vifpe9l2b0/fifutijiliwodekowipuj.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e77288a5---vugukeripevi.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/qv0t6upqhml5kakmoeld36m1mi/modozun.pdfIn PDF document text
    • http://moneymaker-gold.de/files/55690105154.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073c4dfe1a33---todelazox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=keep+talking+and+nobody+explodes+crackPDF link annotation
    • 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_off00011f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9C 18044 bytes
SHA-256: 385ea00f008da2cafb17e8fb9068c3862ee79b7e638e39cf2da8e762b194c4c5
font_01_sfnt_off00014e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E43 11128 bytes
SHA-256: 205bc0f0fe4378809fa180e46a6a94554efcd98b0e8c56f87cb895518c9fbc0a
font_02_sfnt_off000167fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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