Malicious PDF — malware analysis report

Static analysis result for SHA-256 6377af5d185308f5…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 23:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6143d3374b3825032efb224b8a96156b SHA-1: 4caee09b2adac60290a475515c251aa978220a6a SHA-256: 6377af5d185308f5f4c26d1bfe339d3e6d35219da75a7afedf19059f2ce1bf9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/7jhmi987p7pm7ouugprgoa3k6h/jumipuxegoluje.pdf In PDF document text
    • http://susutour.com/userfile/file/tazivuvigodidi.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/zudal.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/figej.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/pitaladofitasidunuwoxoxaw.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/62258285904.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/59686430258.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/7u9o5f66ske6dtgqu5jhvv7u4g/5452767376.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff7a33f0c4---50182437875.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfba40da09---gupizova.pdfIn PDF document text
    • http://elitvorota.ru/f/file/sedirakunad.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/7129223276.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/wifuvepade.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/72782706000.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f1c4abf38---jexodubalotete.pdfIn PDF document text
    • http://builderall.info/userfiles/file/nofejoxobasun.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a3c5c1506---26919021753.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23308d0de0---pubusuniwetaxosamarawejev.pdfIn PDF document text
    • http://apvn.info/userfiles/file/jujemesimitorememi.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/89259697254.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/mamixedonejerusurivo.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/49280421197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=modern+compressible+flow+anderson+solution+pdfPDF 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_off0000db2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2A 11100 bytes
SHA-256: 86b6dba4b062651e7e69d0df234c7bb751d4a1fc40f7e8fe17fad1438d66a51b
font_01_sfnt_off0000f4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 17864 bytes
SHA-256: 5d58439a0bd179524daf0420d94d6d4da402acf1234cd58f5fba2b0d78609033

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