Malicious PDF — malware analysis report

Static analysis result for SHA-256 df0a8b2223271c6d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 10:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: faff10279765344c68addcdc7a20d0e7 SHA-1: ca2b36f01acf7b8989a428355ef54068c59445a5 SHA-256: df0a8b2223271c6d897310fb690cfd02b69dc4912fa73f6d10cab86510f49967
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://allytemp.ru/uplcv?utm_term=123movies+free+no+sign+up PDF link annotation
    • http://cdkuys.handysociality.com/upload/files/ziwititorimokirisa.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gu8f83mdr93ubmq534aohthrs3/vutolawuziravumatidoruzax.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/a67783991b23e3e55c36bf22dbcedf8d/kapetapepem.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/pikurusixeduzo.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/zuwedanimirijakoxelevi.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f051a6f66---26157001467.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/91337857995.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/tapavixurawu.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/27106811893.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/13222326326.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/26462161119.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3pe8bkecf0o6j5gk9rm48p5685/91922701419.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/1129907347.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/9tj43spht21ri803qqjgcjme9t/56497239719.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a043e4378e---58652738141.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/90091667530.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/21483106943.pdfIn PDF document text
    • https://ckmandarin.com/uploads/nodiwasosavif.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/81671273251.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/dalemeteli.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/tuzimelapanemitugatowidar.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/vusozexijarojapirigas.pdfIn PDF document text
    • 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_off0000d660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD660 18084 bytes
SHA-256: 9dfeb9c726f49ea6a9cc4a2e620f49934f38b4fb7f22d9baed0aa26c5133e616
font_01_sfnt_off0001057c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057C 10808 bytes
SHA-256: e38c8c3e0f4668b3fd8c29f95a1e307c2464bf8d3f327f160cbba0c578c7a9f1
font_02_sfnt_off00011e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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