Malicious PDF — malware analysis report

Static analysis result for SHA-256 27321114b4f8dec9…

MALICIOUS

PDF

69.2 KB Created: 2021-09-24 20:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3f3e8a4ce79559a8173b079ded51dcb6 SHA-1: e159583f43302f35359095744864bac597994720 SHA-256: 27321114b4f8dec98eab7de4d73cdf05ec420c687c7b666b142ca9285ff738ed
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://smidgel.ru/uplcv?utm_term=wear+os+root PDF link annotation
    • https://zlataraburmevuckovic.com/files/kurevikakiwed.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138a916245c9---23130897590.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/62637602760.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/kaxerevumir.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/roxuzejamufubuj.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/nidapuwalere.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/24723964013.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/jipupexunorevozez.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b815345ce1---wubegizijujegagedibaluxe.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/titomaxubakuzatimegug.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/tugevenofedutodif.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/fupuxikomexil.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/6663740161.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/88bac4f0764f7bf1c2a060432b647508/29810665428.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/76530050348.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/23080586763.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/10703614574.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376845ab042---19605203576.pdfIn PDF document text
    • https://dukupahit.com/contents/files/jerigo.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/fewuzolidubi.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16148307196af8---vidupetudu.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/paburele.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1630465280cJg4.pdfIn PDF document text
    • http://unsersohn.com/images/file/57502291100.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/3572478262.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/losiluwobufefit.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_off0000b435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB435 9852 bytes
SHA-256: d9195a0ab6815a3719fd159cfa58068de14f4c144688c77171f6ad5f00ac13ab
font_01_sfnt_off0000ca0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 14704 bytes
SHA-256: e8574acb374b84a4bdb1d3a33aabf7024e3263db7d052fa1ec60c677448b45dc