Malicious PDF — malware analysis report

Static analysis result for SHA-256 4684a98ac63973c6…

MALICIOUS

PDF

89.7 KB Created: 2021-07-17 11:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ddcca89114c7150c3ba48fab14ca571 SHA-1: 1040da76fbfbee5c34017e8f5c4f00d6d20f9a43 SHA-256: 4684a98ac63973c6bacaecf57646d7c566234697a18b30ad3d3e90b7df839602
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://teleinwestor.com/userfiles/file/jujenofokapip.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d476fe9648---94780548068.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/118f2a5949ac7b104bfbde37008f9760/lefironixudalerumu.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0ec6a8c35---37786660264.pdf
    • http://albino-pitti.com/pub_img/file/zugajugokobijasuziw.pdf
    • http://almar-bus.pl/userfiles/file/45416061875.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/360fa4efea915689ba40e814562fa30e/76831172140.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/furoxinugonivapuvo.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609024ea80af7---86495759840.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b5ecc1494---davugezatozexubifaz.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d56d03ed1---lisod.pdf
    • https://palcev.ru/userfiles/file/ditotiluwekajoperopuf.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad424b87f3---fefemikevebomexaj.pdf
    • https://suma.ca/upload/editor/file/25139808271.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f998100707efdb742d1ba25a9b02d2cc/ginotigerinofiliginugutob.pdf
    • https://amblamy.ee/upload/file/54490737021.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fdfcd293c---75037693075.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/801d6924cb144ad13308ab66da7cebcd/mamikamivifamumawusi.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e3e799321b9586303dfe348eb8affafc/pokul.pdf
    • http://zulaikhatextile.com/userfiles/files/5606818434.pdf
    • http://autosoftware.company/autoresponders_images/files/totagupuvukox.pdf
    • http://ccforum.kr/uploads/file/1624956958.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/29b1ce2e204515f432457da81fd80e2f/dibuk.pdf
    • https://ebdaatcoop.com/userfiles/files/78200948864.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=solution+of+maths+sample+paper+2020+class+10
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8c5.bin
1bdff5d33d891ee5cee09ae28b11390cad53ee06b231416c0bff88bdbbcfaa56
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C5 17552 bytes
font_01_sfnt_off000126f5.bin
f92826d957320412129a7fcde1a208b3af8c963ceb9ef3d73b9a40f68ece7275
pdf-font-stream PDF embedded font (sfnt) at offset 0x126F5 11212 bytes
font_02_sfnt_off00014110.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14110 16792 bytes