Malicious PDF — malware analysis report

Static analysis result for SHA-256 619e56e175635e70…

MALICIOUS

PDF

88.0 KB Created: 2021-09-04 14:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7f81778885387bc3b58a4826c9440293 SHA-1: c2b4d0e30a1c9af6f702fa6a436b68fd6f231849 SHA-256: 619e56e175635e70be482761775aeca288f70ed225f60ed049c38d722ee49921
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the download or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://obermeyer-modemarkt.de/upload/file/45081107427.pdf In PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/molapufuponomobaxufir.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/wapige.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/goseledekisela.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/63c932430295e081b5606999f24681ed/82319482837.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/9948905464.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f6407e41958---21803651123.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/86860290735.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/71171759806.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/80423292915.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1b599df3e99bea56e39d7fb79d84047d/76042115156.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f837797b8---vojiv.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4cb876eaf---80444835435.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210621_26978B2552302C81.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/28001421082.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/wuvibefubegaduse.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/lijekemedet.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/65a56694e7287010f1d914eb48245cae/59236312967.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/wulepe.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/10125218835.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/qf68u6ocesgcnndi6bk6sthv44/navogokisodiwutib.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/52429387294.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/mhrjhpdv9qv81nr2c1u777bff7/50503647066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=flowers+names+in+english+to+telugu+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF3 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000e3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EB 23636 bytes
SHA-256: 22fd137b2b1309685a09f8b93aadb99ae81a935f9387085490c9583a96b755c9
font_02_sfnt_off00011fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000137c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C4 11108 bytes
SHA-256: 5e800eb28bc9218e80b5a9f31691a4bee00a06f8bd43324104af0580e635cce3

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