Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa33fa5de84bd96…

MALICIOUS

PDF

85.2 KB Created: 2021-09-23 14:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11f15323712040e206bf2765fda80ff2 SHA-1: 5239918b2f242902190056a133adcf53d6c50794 SHA-256: daa33fa5de84bd96d5750c518bfa36dbfc481cb0d0bf6c8582589d7483e69bda
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, pointing to various domains, some of which appear to be compromised CMS uploads. Heuristics indicate this is a link farm on disposable hosting, and ML classification strongly suggests maliciousness. ClamAV also detected it as a phishing trojan. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=best+ipad+open+world+games PDF link annotation
    • http://fbrasil.com/userfiles/file///ledefejeka.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613187b0e829b---tofovaloxoxud.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/19813079317.pdfIn PDF document text
    • http://www.heksan.com.pl/file/93886998619.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/afcdcd50d8fdd29ea019cc65e3016a13/tamuwumivatosoxuzu.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/merosurunaxomagomuvepos.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b22cd6ea7d---95268115393.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/42216196271.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/ximolatar.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/15434186619.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/posilo.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/49455782404.pdfIn PDF document text
    • http://tfforming.ru/d/files/52417266509.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/tinumok.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/lewelivukasiwasolaza.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/rasoxukumevadivut.pdfIn PDF document text
    • http://stisk.com/file/2410638355.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/mijibiwozelatuzurerowam.pdfIn PDF document text
    • https://magic-ray.shop/uploads/files/ravebaperinek.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/36030212074.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/vewowufiko.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614300d175248---85535382396.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/xepolafeki.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/10199080268.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/89721423986.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_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 17236 bytes
SHA-256: 486d63e6fac79d63c7dcf4a68a2cb076df1eca491cef6fc59da901f377185a2f
font_01_sfnt_off0001161d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E34 10872 bytes
SHA-256: 8eb242555c23300e735d2a05a43481967f8fd554eea30fff2195be36517c6dc2

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