Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa19c2a2849e9fa3…

MALICIOUS

PDF

94.9 KB Created: 2021-09-07 21:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f52e8b7f515aaa325ceddbb1211abf57 SHA-1: c5d34bac7ba017736e6c52021ebbdc557ac2efd0 SHA-256: aa19c2a2849e9fa311e6210ef80237f59e9b5d6f68cbb52388a46747ea55667d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Additionally, numerous external links were found, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cc9f60145---xeratuniloju.pdf In PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/18d511535a288366956607598195d8f4/lotigesuk.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/joravubipopajejabovola.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/sudodilewowetevefixa.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/webal.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/fawojozufisifod.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160952b96d06e3---94438176827.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/93211145532.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e578fabb705---dufofawisukiliduzu.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/donuli.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/miribepafobidoruluvetenir.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/37852049481.pdfIn PDF document text
    • http://web68s.com/upload/files/36845195688.pdfIn PDF document text
    • https://orrizon.ru/images/file/meviperoxusafanil.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161292775e3eef---3829157030.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1611511b5d80da---88189113826.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/32169326570.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/39126370813.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/71692692902.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/53414696359.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c370a572d9c---75928089121.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d3773290553---vuvuzupufasulew.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/7441474569.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/gikadumigozikegivubus.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/58341788351.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/didarexajilojiwuxuxefafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pantone+colors+code+pdfPDF 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_off00010ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD2 19548 bytes
SHA-256: 38cf4c2d0ff2d4f01a78856daa8ba16d18b7ba8199ffd6753636cab9e0c513bf
font_01_sfnt_off00013d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15576 10520 bytes
SHA-256: 44598b822d64b0e84836f9642903bdde45ac6743faadbf4836d159398efd2e8e

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