Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f49f4ba8d25558…

MALICIOUS

PDF

89.8 KB Created: 2021-08-10 05:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b2d08cf6c41b89e03436b960a3b41d24 SHA-1: 5875b1f280e43cdb27d5b5774dfdf0ee41439a21 SHA-256: b9f49f4ba8d25558b9d9a733e22a90e6f6e5bd4aedaa444535f2928519fb9363
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely intended to lure users into downloading further malicious content or visiting phishing sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://istanbulbalbir.com/upload/ckfinder/files/62581440642.pdf In PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/34216fd1c6e3ce69aa29762af7e0bfe4/dejelavubawoparuledusa.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/31015983201.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/h4m2viflc5ropvpff72j5uab4s/sowarexexexesomudexubo.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/puwagugurov.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609a227905cca---wubadulisizewupofo.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ecb77847e---mirepetaf.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/polodotefakosagipuwikumez.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111085f6c16c---30834099253.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/24917035496.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/momidukijekexadura.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/nf0uhrv58su2dbgmdobd3bnpb2/40913484273.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c4e201dae---gigobenowubalewunisaru.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/9520199492.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41525606580.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/xasakafitim.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/20580104344.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/44902acc323bafca95b5b8c49434b4fa/22967697840.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7448f7e9bf7dbe4efcd8b2790a863cfb/35086950796.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/64610332176.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b03f0159d00---1414460724.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/68702735012.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/tenumokurumijoneguputed.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/33070537437.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/82527374108.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210712222155.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/50960148619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=driver+booster+full+2021+megaPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 11056 bytes
SHA-256: 0307813a7825e73289e35602b9b6e8e42bb717a4e4f26e6283eca743fa58132c
font_01_sfnt_off00011477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C89 17336 bytes
SHA-256: 56abc6761e88675e8917413d795dfe39dfdb3f7e6231cd9b031911a141392fb5

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