Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f541659e332b0c0…

MALICIOUS

PDF

69.7 KB Created: 2021-09-19 02:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5cb23786073ef2c1b87732a61bba857b SHA-1: 8f030ad29e7268108996e584921cc37343565c64 SHA-256: 2f541659e332b0c0c8df3ef0f714a8973fe42a5fc1231dfd77c3dd5e6462c0fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains. The presence of a link farm suggests an attempt to direct users to malicious content or downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://chcial.ru/uplcv?utm_term=iptv+extreme+apk+download+pc PDF link annotation
    • http://lexxyin.net/files/fckeditor/file/62790537056.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/sekuvutovaxomipetowibanop.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/9507016765.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///53130131116.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/mewagemugaginakima.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/98727453002.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/fopeb.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d9536398bdda20b0b2f364eaa716a286/bimogujejigebabuzijivef.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/26529773136.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/pezitogo.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/xakirabatuwovubuwek.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/vuxepo.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/suvekirodokogatimof.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/xugepujoxu.pdfIn PDF document text
    • https://phm.vn/upload/files/88892695697.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/jenegilopudiluw.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/36342135982.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/857f2bb3b18bea1ce572b5becb14a4bb/jugetaxujujudupimurixobu.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/rumixememulavipasuvutage.pdfIn PDF document text
    • https://songhongresort.com/img/files/12025870885.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/dobevunobiganezuvug.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/xobonuvututuriworo.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391033af2c5---25675465768.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/32157778616.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/fesafovuwokik.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/66499420515.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/81574140152.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_off0000b2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BE 10712 bytes
SHA-256: 7dbd24f6152490ebc86363268362ffac3b7d95e4149ad57e52bfe33517197910
font_01_sfnt_off0000cb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37C 15056 bytes
SHA-256: dc0b175fedb6b01855d6b2bb1f125f49ff9a20bbd1fe2916425bfcf320a5d92c