Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e564b28b2290e50…

MALICIOUS

PDF

78.0 KB Created: 2021-08-27 15:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4a287b5042730c3d94b5dce8cc9a5c2e SHA-1: cb6a014a97c7269051c794ca660888fbd8f2ce43 SHA-256: 8e564b28b2290e5078c8519afcb358f4597ef68f4835a171375ee2857188d4a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to direct users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the structure and heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://thermcom.cz/userfiles/file/13991822601.pdf In PDF document text
    • http://artside.org/data/temp/file/baruligubun.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/2adb2a09a7a323fec962b5f2c73dc8e8/18178518039.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/vonimobinitetop.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e26ef2a8a---7018722176.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef9f8443b0---92944919976.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/givozozujulisej.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/58816601669.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/c525d94e15c8e6a8fa9997ca24b78afe/54988693583.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/gorutelilezinunavunokog.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/molipu.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/vubumumuximovifulipa.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607b444429ed3---lujanal.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/jovomusofu.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090a4b4592ba---gufotivizididu.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/20fk6dpuldqkrlp9golbpbmo83/gesogupowigiluxabelidejuf.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/cfa858b4be588875e3069a99ee10eb82/zijalorinosenoxezoz.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/ruxurolezasasoxisizorej.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/64b763dfcd63d8aedc68474331d801b8/49038537658.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a316f2ee0---76945889626.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/61598338038.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/wefokifovutewepezu.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087bb3bc1d7b---jelozobonuwigiwewibano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=live+gme+stock+tickerPDF 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_off0000cbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC9 10376 bytes
SHA-256: 2338eb916f1edd064bcf104c8009e4a7064a51d59e936d55ffbcf343df82c4a0
font_01_sfnt_off0000e354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 18048 bytes
SHA-256: c246d3fbaf3d1915e4512406ab96c3dc5fd22641f0712f512237f0e07988c46d

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