Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7fa31865d55fe8…

MALICIOUS

PDF

83.5 KB Created: 2021-10-07 12:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2e73d86addf6e1f201221424bff0aaa6 SHA-1: 7e0fcf58d8d065b301dd303f6e6fe079b8eee4ac SHA-256: 5c7fa31865d55fe81835cd1137b029a5bdf6acf852f360c3cbc4bd49556b495b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as containing a link farm pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious. The primary attack pattern involves directing users to external URLs, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://udelimpa.es/ckfinder/userfiles/files/fuzodufebevuverewi.pdf In PDF document text
    • http://shinaval.ru/userfiles/file/79573844439.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/35976514900.pdfIn PDF document text
    • http://homeopathyhk.com/files/26719887863.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/92679935231.pdfIn PDF document text
    • http://livilgirls.com/files/vomafojenoperapepunapisun.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/51676285843.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jutawazali.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/163072064649149731293.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/zitixitabofeto.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c19ed620ca---dexugizotuwodowigatubudox.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/fijizakowoguxuxiwuzete.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/64236367678.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/16d6a733f072975fef160faad720c7d5/poxanutowo.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/ladokabexudolizomenapuwo.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/musarululomejowelupiwul.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/nipez.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161596b4171358---mamolisagajuxezavibexuj.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7375d212ec74dd6a267808e230606029/13418333682.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/vobit.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/torisizolofebopajizuwurow.pdfIn PDF document text
    • http://art-ball.net/files/file/xutuzaxiboxin.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/falitowoxuwoza.pdfIn PDF document text
    • https://network-italia.com/file/sibisizas.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/95521049708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=all+about+mumpsPDF 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_off0000e175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE175 10208 bytes
SHA-256: 4549b27d67ff8668ad35619544c0ce21c399dbe71bd255b8a8d1f88155758aae
font_01_sfnt_off0000f83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001104d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104D 18528 bytes
SHA-256: 2765417e15bc24cf0d00eb403fa8b91108274b6d0af924fa1df509d644ee9a52