Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b41e6e41784add…

MALICIOUS

PDF

75.7 KB Created: 2021-07-23 11:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29efdfa26def04e61eadc554d0493015 SHA-1: ae3edcad6b4c526acaebfb4da0a6827592f68acf SHA-256: 85b41e6e41784add37a66bad076c25a079aa855001775c1ebef1b9044a0a4919
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://ahcxdq.com/uploads/file/01080231829.pdf In PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608062dd13539---34850538534.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/dujuruzapumamewixemiza.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/96298665992.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/iqhut5s35fgro88p5o33fvbnm1/wezeralakokimovipepa.pdfIn PDF document text
    • http://cocoal.com/uploads/file/57381219703.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/fikit.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/23215183749.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/damonekukazopunopure.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/56623126508.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/dc7b76e96240ab699101433380da2653/72473804336.pdfIn PDF document text
    • http://biomisszio.hu/tmp/27088152664.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/matunupamugedoromemozevon.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/78577467928.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/zoxafaxuganisubote.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e7641040781555800c6a9d133d30213b/21516699200.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608501a68eede---guvugox.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/64074548723.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/lifebonizanujopifokok.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5a9ddd3af---vewiladudajunurikovediwul.pdfIn PDF document text
    • http://coffee33.ru/archive/file/39661699589.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d541181c6---71341683802.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608056d6aed77---jorekanilojatasapatewite.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/28058725520.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/dinow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=na+just+for+today+daily+meditation+pdf+downloadPDF 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_off0000c44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44D 11068 bytes
SHA-256: c92f3a3069bbb1b15817f7a1a405b615fc9e770374c599a432809d7fbb69e4dc
font_01_sfnt_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 16108 bytes
SHA-256: 1165039a134fe3d0828884c5cd56dd6273d171794f558f16ad9b4197320d0e4a
font_02_sfnt_off000107dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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