Malicious PDF — malware analysis report

Static analysis result for SHA-256 93571a74fc2c8364…

MALICIOUS

PDF

85.4 KB Created: 2021-09-17 10:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a9500edbea1d77a951eb0c7a37346a5b SHA-1: acd5ee93f6163b9b8b4fd320a483773a0310b13c SHA-256: 93571a74fc2c836431e5d3525e41e7360951d7f837be54a82c5aecdb1f928982
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains embedded JavaScript and functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The primary attack pattern appears to be redirecting users through a series of links, likely to a phishing page or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://righetti-ticozzi.it/userfiles/files/miwipixuwatasidumaj.pdf In PDF document text
    • http://safarang.com/basefile/files/gebixejenazesuzusedig.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090414323892.pdfIn PDF document text
    • http://www.xzass.org/ckfinder/userfiles/files/gogunelodumivizoduxazeva.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/57666210326.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4724cc9b7---19101398492.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161356c67c95eb---zumuvitarivojoxizutalet.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/fo0bovh7ob57454q6i6vp6ru7t/dabakalejivi.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/90428380791.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/70473881972.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/19830441906.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/kafaba.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eecd9882c4---zifajefe.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/semomepotipakosikupufonig.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/b7qc455q3u3qacfn2d797lf4r7/24527388860.pdfIn PDF document text
    • http://surtek.biz/image/files/20150328_143939.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613017b965707---56043405999.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ta6l6qk9bu4mevab93ctrv7a6b/69369111559.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/41311068047.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/vaxekexetilalobomepivebu.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/viwexemefenirodanep.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/089f0e50bf441d6f9f669fa8cb6ccef0/95023221178.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/17434274544.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/biguxagaripowe.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/36576877453.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/af39b66168e89d88e4b122f66c9e9204/pipimunasis.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/76878985701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gay+films+online+freePDF 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_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF99 18604 bytes
SHA-256: b1ec161cc99686f144b06600c7a2bc09cb0f31518feb55235e6efcbd22ac4223
font_02_sfnt_off00013047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13047 10432 bytes
SHA-256: 6ddf5ff3cb33a003635e75c66f24c9d3412a84768fb44a58cac7639848704214

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