Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e6cdc4cfef375c…

MALICIOUS

PDF

92.7 KB Created: 2021-07-20 18:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f5435e83243964f6fda9e3e85b201d17 SHA-1: 261586279f459383bf212e8eff05f4110f08c7fd SHA-256: 82e6cdc4cfef375c4a03005c60b6f46288e683769be4cbcc3d4d76499f2ff7eb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://lovesushiscv.com/uploads/files/28434503219.pdf In PDF document text
    • http://igabana.com/upfolder/e/files/20210718143331.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/sfu9tgumsnnh1rvr2abasikj64/75363276932.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/sefibijulebopaji.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/1ae0eb0fb469ff1fc8067de70e300173/fifidiwedasiloluboted.pdfIn PDF document text
    • https://renault-service.com/userfiles/79371950936.pdfIn PDF document text
    • https://afayl.com/userfiles/file/doforebezonurikaweb.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/76392589579.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f6c1c1454---71687022270.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609ace478f342---30458318832.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/92585159821.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/66433006345.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210708173119154392hak0y.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2fa584a9c---11345803069.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/12292170343.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fc356534f---73602904354.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/72412642033.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/d801fcabe22cf88cbd4ac85debeb72c8/8552506624.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/72472848602.pdfIn PDF document text
    • http://vodnik48.ru/content/file/vexaruju.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607043142d794---35105451496.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/gufewo.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/81416849373.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609784fa0c026---22627130894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=who+invented+telephone+and+what+yearPDF 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_off0001083c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083C 10580 bytes
SHA-256: 7f8ecf9700c63b05996bc7969c0068ccae835a44cdc832a8ebb0b7514d7caafb
font_01_sfnt_off0001205b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205B 17300 bytes
SHA-256: f7ad1471acd6f46a65c7242b38a76fa4c456852a30b0270bbebfb532b52e2e8d
font_02_sfnt_off00014d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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