Malicious PDF — malware analysis report

Static analysis result for SHA-256 111e757c626f4e51…

MALICIOUS

PDF

79.8 KB Created: 2021-09-03 19:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f4b6d769bdca4354d6cc1a03beb08b7a SHA-1: b0d0ed9091a390e1015c4fe0d3095424b0c5fbd2 SHA-256: 111e757c626f4e51b117f4a8a247ad0baa8d0040b9b186bd4be88db45d5de491
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://drafthe.ru/uplcv?utm_term=how+do+i+rotate+a+pdf+file+in+word PDF link annotation
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f638e260c---wedapufukipigenibekij.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/d4ae27b76a91f9d358527a5a6466fa42/gusetupewakolu.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/nabajufigovemi.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63bdb5cdac---52458862771.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cf1990c89---valagirodavixobugazugizit.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b7ed573fd1---39329017557.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/79751073343.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c324d6e85b---7371015072.pdfIn PDF document text
    • http://parilka.by/var/upload/file/22839721048.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160da7e9ad9e89---33892223338.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072de5d227c2---58789990348.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/669d2b9cdf86d60ddf305f16eba353be/vimotizagelenegafiwapidox.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096c7b13f322---14661593755.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/89239754381.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10848bd864---xaram.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/54937530248.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/53640670897.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/e5af02311f4eac962289f4ad8e658343/fefixu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acef1bea48---57984599379.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f26db7a5a1---51940326175.pdfIn PDF document text
    • http://888chji.com/userfiles/files/6911461753.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/49319450217.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/rfaiqrua5age2iuj6pivpinlh2/najiwotixuxowo.pdfIn PDF document text
    • http://www.edgartownschool.org/uploads/files/xafazixiner.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/98817005023.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/8cd65cab4c7b781ae5cabdf2fd93d055/fikasijore.pdfIn PDF document text
    • 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_off0000d4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 10400 bytes
SHA-256: c06cf4ba152e8b1fc597cf8a6687a2af04f216b56d4c701a9ea483f8b5934e08
font_02_sfnt_off000104ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AB 17152 bytes
SHA-256: 7f8424cd0cebce54ee04d8994f3d439553ff12834c1bc7c380a3b9127abbb7bd

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