Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e807287a9e5d25f…

MALICIOUS

PDF

75.9 KB Created: 2021-06-26 15:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9a5423c3fbdecb3427bd855c56336964 SHA-1: 81597c881d1f9f726fea950158f7d305392cb6a5 SHA-256: 1e807287a9e5d25f9e359358e74cfd58bedae509c6b84829c538dc06d9c53ea2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. These links form a link farm designed to trick users into downloading malicious files, as indicated by the ClamAV detection and ML classifier. The embedded JavaScript likely facilitates the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://archism.ru/uplcv?utm_term=download+harry+potter+movies+in+english PDF link annotation
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/8ebcc2c324398f81d7b8229f0b814940/durexivukepaderok.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/c15f63a626327fadc3c66288886f0a11/89823536985.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/13830537780.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/666f76710c03e1fc8966213a7a20d524/62680541674.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/26448913893.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/rowevetamanuvesepemu.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/97941e04b3a658d21af6f14ae2c166b3/gufozefejomafenejunula.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608487b71ab74---pakatatoluta.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/acc72408299f51d713c80101d7768c1a/tojexapowepegame.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/766aa4da0c6e4105b05a388155a2ee7d/gekisorok.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/24411243536.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160982ff701ae6---kojewijofakisok.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/lifuzevikubamomabem.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/fivikof.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/2954539668.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/c6dce914bf9d3ad8588b2acadf966818/37557827745.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/warubufejoditifukomewuzen.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/908b6d73e7b5c765e462a2096808391e/93616035809.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/kk0sqft323sjoqg4fvvsaq2pkh/93682255344.pdfIn PDF document text
    • https://papiratisk.cz/soubory/baladoripegawawomasibe.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/e0c84c6f6fe79eec0cd4dbe87a384722/57923640140.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/96746088667.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607448428dee7---3335363037.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_off0000c4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D1 11108 bytes
SHA-256: b302b3885734eba110cad1eb1e378ce3a2ff84dd19a21e15704a78d35c1bddec
font_01_sfnt_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 16808 bytes
SHA-256: 91fd407e1f5ab44fb55efb92941f18b867cd335f2887989cecb1e3d623b3150e
font_02_sfnt_off00010a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1