Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90562df89fee470…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 13:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cc73bde2d4f20c9b2255288eb2a1f050 SHA-1: 52e70ac75329863c736102c019ea6d60b201616d SHA-256: d90562df89fee470c363093b4c09cd26c6341d764cace2a4d7e689aa8a5da5b7
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://cristal-in.fr/userfiles/file/64342028692.pdf In PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/f33dbc80ffa7deaebad634fca5abfa6c/fudugibov.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160982b9682b10---wunifovetoxuzosino.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/zokoxapedebex.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/dowozorarema.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/35833651908.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/jerufupejesixuwav.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/98950349469.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/cc4f0ece97e50920e746d1f4428d1e09/dasolasadubo.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/b365d4445ec17b71542daddcacc65865/mimofomumosesosaxolusitu.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210624115908_4zdk7p.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/ketezatumeferuwiduguluseb.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1626118061.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/36902051600.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab594461fd1---gataxitenatotewugizodusi.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/wokiramitelizefa.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/sewikutomufokaro.pdfIn PDF document text
    • http://turatabor.hu/media/62014174454.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd45363a42c---42812308487.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d19fed339---89125738958.pdfIn PDF document text
    • https://campermagazine.tv/public/file/bomidebajorifunigelab.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/77521328743.pdfIn PDF document text
    • http://soupworld.de/upload/file/bibevifoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ninebot+es1+repair+manualPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D2 20760 bytes
SHA-256: fe38fade3212f5a23b088fc31778db9432b1ae7eb48b98bb407e705c4a4f4854
font_01_sfnt_off0000ef38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001074f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074F 10680 bytes
SHA-256: 513c7ac90702fcab079772fdfa7f32a22af940d326b8eb31ea968c7448c63098
font_03_sfnt_off00011f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9A 16148 bytes
SHA-256: 1c024217ce21bb66922f73502146d3c7616b47413e2e194c36dd680b30e64e78

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