Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e0af836996f7e8f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 12:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e13a96a36e754d61944d2623261e5e1 SHA-1: 896e8407a963eb047107a44e6a1fecfdbf6b0099 SHA-256: 9e0af836996f7e8f95cef1eef8e891963a6ce8b62f7b9aa492cd930bd8dd290b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised or disposable hosting sites that serve PDF files. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests a coordinated effort to distribute malicious content through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://aggengr.com/uploads/CMS/file/fenojejekalavufepeso.pdf In PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e3c95707223---vefoxunijugadi.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/kofuvujuvufazidix.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/92088345345.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16094d32535611---39483241880.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/bakakutipedesesu.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/76291937998.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/navavili.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ea9ee5733---katixusajixobifopixepe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9d0c59618---galawakilopitorulikagewex.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/rixajura.pdfIn PDF document text
    • http://didula.ru/img/file/40272141087.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/xukadabik.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/dubabugokaboz.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ectdu992ada53bl33keir4ule2/suronabanexebomidi.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/maxoxifojuledobu.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/96664923574.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210718161945.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/lj3ilp61bulqevjv82dkeh7it4/72677157844.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/2075d75653a51f82fbcfa054043559a7/56709887603.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/5471202436.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609618c6cbaff---79952887511.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/12587022030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=shostakovich+cello+sonata+pdfPDF 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_off0000dca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 17760 bytes
SHA-256: ba52d64d9aa120c92b4ecd1903e50dc7c3274687db0956d9ec58f7adaea8b82a
font_02_sfnt_off0001229d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229D 10852 bytes
SHA-256: d047d99969a02be32a98175ff0be058dc8bfd320b13d9e96b9ce149e922ddc53

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