Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6eb36b0944f455e…

MALICIOUS

PDF

86.4 KB Created: 2021-08-30 21:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 871f84976be3f86f0e1fdd1228d9bac9 SHA-1: 83c39c423085d602cc2d0afda525584f01dc3917 SHA-256: e6eb36b0944f455e9bbf3ec418e179b1bf88367efab1492f970e9d0bd70ae638
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://philabc.ru/uplcv?utm_term=laugh+and+smile PDF link annotation
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bbc7845fa5---69108332189.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/mabesagikugijitomupo.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0385859001624614242.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/ropaju.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108e98256940---melibifomagavo.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/2448a4208f3df52ca8889cdd4384b5cc/furixabebibarusonuvo.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/78727549127.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/76474579999.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/17160052131.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/59632237597.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/78360046328.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e41a4ce74---84096193915.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/1233286623.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/2df057d899fe7ad11a1d18bc17858cfc/32771199654.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/guribixotuw.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e3f5cbda7---90345822678.pdfIn PDF document text
    • http://myslizdrave.com/soubory/jixamudogoluzederosebaxi.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/27115601973.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a035264bb1---57869445288.pdfIn PDF document text
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/70547876962.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/2663911983.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/05aef68b9e7373e3de53930925639a96/4686014415.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4f24364ae---69938800698.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/pijes.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_off0000ed35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001054c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 10436 bytes
SHA-256: c72f41b09f674a40f9c5f429972bb827522f1329f5e306c32c8bc07018998c32
font_02_sfnt_off00011c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C69 18544 bytes
SHA-256: e8a62694a57322f2efea4d709b17542770b127e36a39f71ea6f958e7738f3d49

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