Malicious PDF — malware analysis report

Static analysis result for SHA-256 6794a7fc1d0b2b29…

MALICIOUS

PDF

72.5 KB Created: 2021-07-20 04:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6e39893bbedfc2c0c31775fb2f0fb7a7 SHA-1: ec861b29d097b6c4d98a23a796c8dd95c152499e SHA-256: 6794a7fc1d0b2b29c453f404e2ba64944498f58649b088d65d4181c310803a51
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://schokoladenfontaene.de/idata/zavuviwatuga.pdf In PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/e4210681fc96a06df2225e442ad2a7e7/15838840576.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/wusavesipusexixijitupu.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbbdfec11c2---77989572849.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076a2df90881---27966875774.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b05043b1a---pifepitubi.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/3831534191.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/waxerenapemune.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608986fd2a3bb---72569001903.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/a4c7cff329953e6ebcd8a07b76af49b0/76962911905.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/69609935630.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/30897323228.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/833d48fa5c880b51fb4b2d22bb9a747b/19283022141.pdfIn PDF document text
    • http://axwelindia.com/uploads/gemonutetalugezabedum.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/jezuweluzuzonumas.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/897796b6d04f1ab617bd7d958253ffc9/silogipafidugafivewaga.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/vagekirekilotefijel.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/83975de4064f138b3fdc1c5fd8c7a4bd/damukalipazileworozaxenid.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e53e594800---26196784434.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/bupiwamilopuferijis.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8eg08587426q8r37gguo4spd43/gupokovepijifajoro.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/qko55uhid4udcjga37qsv27bv2/93992966068.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160dca1a276ec0---27308118343.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/xixuzatonekefo.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0fb3465a0cd45f5353b0b5ed4194024c/19470119282.pdfIn PDF document text
    • https://shibbirs.com/media/files/50695028260.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074582f84ec5---49459518137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=hunting+the+elements+video+worksheet+answer+keyPDF 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_off0000bc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49C 11144 bytes
SHA-256: 51409a7525b6bc90ac19d21815a5d8f2b8aea184f283fbac130cb99257b02096
font_02_sfnt_off0000ee43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE43 15460 bytes
SHA-256: 44aaa5bf93304a84a7c71d9780bdf60d914a1547a95c44e37b52e9a8431b2cda