Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b10e106d1842bf…

MALICIOUS

PDF

82.9 KB Created: 2021-07-16 11:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9e724f70a7e36d1ad7c334ec3371fad0 SHA-1: c37380e425307dc1e629ab0be24062c1587c449a SHA-256: b5b10e106d1842bfeddb1dd27fbe6b59069fb06e86ef55adaedc1ff49e1950fc
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which point to PDFs hosted on compromised WordPress sites, suggesting a link farm designed to lead users to malicious content. The presence of these links and the nature of the hosting indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/o6eh40dodq451hh27i0bk3br60/97338904292.pdf In PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ab84a7df647c6f7ff85c827e94adcb7f/benalikorunesinurawokuzi.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/70469105704.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/sejolilasip.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/96719372254.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160773932b5a99---31598689100.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814e1cf3f4a---gekojapugezugovolubonu.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/86481890170.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/19475947179.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8248b0aa0---vudibetalorezupuzolabosol.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/kolewomupi.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/18455950678.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/60904a4b0a4fc477bc1af2ffa7f0728f/49048905719.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/68669667832.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c2b5ec43a---wiralidom.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/u9so17jlkp57d56lcp3ogp5vdh/46186227863.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/hvf78u1j9ic27dbbf00akinljn/poxejunexuwabojajixatumu.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/dovaxebiketatagel.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/dawil.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/568c9b0739a8d90793825e89ab20a544/36688041570.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d56d453dd---88383557612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+give+yourself+sharpness+1000+in+minecraftPDF 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_off0000da81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA81 11460 bytes
SHA-256: d3df47abe8d6b9ec24f8915f2f1fe2172a3815f197ce4f029263888c0347167f
font_01_sfnt_off0000f57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57C 18196 bytes
SHA-256: 71e84e0f3736d7e2c541c8a58ae9ffbe35dab1d475801d0cf5f9e3ae21e785f7
font_02_sfnt_off000125fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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