Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11d22fcb972a653…

MALICIOUS

PDF

76.0 KB Created: 2021-09-03 01:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 97e9ba2341d7461b7173e7f3d83e879c SHA-1: 731d43a564b0ccf5baca3f0627d986d263420a00 SHA-256: b11d22fcb972a653f42c681b181ce5cb166741db3a2989a216f3fe62af57fc5b
156 Risk Score

Malware Insights

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

The PDF contains a link farm, directing users to multiple URLs hosted on compromised WordPress sites. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/puvonidewaga.pdf In PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad3cc527ee---boponakotoxepevefak.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/d8b73f3ec19a03cc84f1fca9cbfbd282/kejepomufazimi.pdfIn PDF document text
    • http://wych123.com/upload/files/73334239053.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/47872777504.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/u9ualp9mfhk7i1m1onl66ep3jq/44067098626.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/labudiwevomonir.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/68084151510.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5b30c7c42---rejopevurako.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/573e73829edc6f18f56102b94cc90d00/gineropo.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/66281065444.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/78934418553.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/tidenupadewamapajeg.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd44fbd5fc---30290032115.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/3851642676.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/7929c3b709e40135e31471a9ba8c6532/lafinifakutufatufasomu.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d940993cf1---ledepesopetugobokan.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/78885799039.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210809173028758.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/f8b19be7f83b9bd7d76fd39f85f14852/pidabonirav.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/71575416932.pdfIn PDF document text
    • http://ruihuitax.com/files/file/fipurusuwuwufawus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=caballo+de+troya+pdf+descargar+gratisPDF 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_off0000c287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC287 18128 bytes
SHA-256: 035f51e83bfe5bfdbd1eb364ed9e45541b50deb9cf44531f104d2c68fcbc1930
font_01_sfnt_off0000f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 10976 bytes
SHA-256: 3f8e8b56361092b3215a079ff795a8dd1b1fcca3ddc26483a97c600db9a6ddda
font_02_sfnt_off00010a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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