Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4dd005ce5a13cb…

MALICIOUS

PDF

86.0 KB Created: 2021-09-13 07:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e83836c574639a92362bd061d182841d SHA-1: d6ac4f55b3ddc0cd67338455c37664bb3b387fc1 SHA-256: df4dd005ce5a13cb6e4077d4c5010e91dd233961b7d32dbf96a1ede44d84a48b
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting. These links form a link farm, likely intended to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute the embedded JavaScript, which in turn facilitates the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://garglob.ru/uplcv?utm_term=free+photoshop+for+university+students PDF link annotation
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/68642386814.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/jutebosavutefomem.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af9a58b9d1---derizigezededa.pdfIn PDF document text
    • http://gaudi.tw/upload/files/fofojoxibadubazopujan.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/22438598645.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133252bb6be0---52442134628.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/pewawovagev.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/1152180595.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210910031220.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/kupalewosipo.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/51607441517.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/55373804061.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109040001029122.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d00e7bcbcf---77612693701.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/21295876513.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/bividusej.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d5030aea1---32691157203.pdfIn PDF document text
    • http://aimic.com/userfiles/file/95364087869.pdfIn PDF document text
    • http://strahyi.ru/images/file/17938342867.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/17512959263.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/nedajeziv.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/nodafewo.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/99945940827.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138960b1607e---73251545651.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/ruzunezikatikuxaxan.pdfIn PDF document text
    • https://kiptep.ru/file/92392011056.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96fcirm1uo5d99qq32bhkn99k4/wexuv.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_off0000ebd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD2 17416 bytes
SHA-256: 2251b476cbc40d7b39b77a55c737540344fa127bd32a777c31c308c64c29d3fd
font_01_sfnt_off00011936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11936 10644 bytes
SHA-256: e69c47b1a5b212680a82ac5a37e4831c7d49ff41373dad11f7d3a04800e0b814
font_02_sfnt_off00013183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.