Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e5b5f43c6adf50…

MALICIOUS

PDF

84.4 KB Created: 2021-07-06 10:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 44ac1778d4e246e70e372bd4b7719542 SHA-1: 8795cc21968e0d80c980f30274b1ab567b33dcd4 SHA-256: b3e5b5f43c6adf50ee299aa910ab20e4d257a5757282ddfa3b7421fbc726aee9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to manipulate search engine results or host malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farms suggests an attempt to redirect users to potentially harmful sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7e19b886---99257729789.pdf In PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/6bb22bf2b5a8dcadee1f3d9313479208/nosojorelaxigate.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/9t7e788rnflpkdljjal5sqqv98/19874956716.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/79790b449528bcbb1fb801af467129ab/mamifiwogitexowonitizajuz.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083666811b1d---30989122225.pdfIn PDF document text
    • http://kelvista.lt/images/files/82490833643.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/rovulesojirineb.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/89l0v8rm4v29erpt2p3ajki081/81446795777.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780c772b9ea---2883569225.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/11437939327.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/o6vmp3oicrqg5v3tlnmebq2dg5/fegifazifogir.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/416565645d98787252c7ab2b166f2cec/91362043057.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/ligopivonafoje.pdfIn PDF document text
    • http://garderoba.sk/images/_file/basonufijopedosavani.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da916b1290---59499973276.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfc4357e31---18517249599.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607712b74adb1---wumusidapirifojofesazix.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/vad2dve9a03bsvv435k1o2skcb/xumizowimafusitu.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/38386436615.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/42e44ae7d8ffa76c6f91bbe8035ebc95/84453775610.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/joborujipemivenefa.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///81795680308.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/90176550378.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b27b3c5f40---kobulu.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/vafirobibakinubevo.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/98777822483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=back+pain+between+shoulder+blades+when+breathingPDF 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_off0000e84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10061 15968 bytes
SHA-256: 159692aa17f1880d7703f8b71ffb7f03ad0652ba183c18b3e67118c4e9f95a29
font_02_sfnt_off0001298b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298B 11264 bytes
SHA-256: e4bee99a5e5ea9824f8a5abceaad78185a634c130bef5ef3077eb808771506ac