Malicious PDF — malware analysis report

Static analysis result for SHA-256 276404570443f016…

MALICIOUS

PDF

119.7 KB Created: 2021-06-28 04:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5ca234f9b8b25a6cdaa26df603288e8 SHA-1: 62bb28618ba4de1d6ab948af941c64b3489006a7 SHA-256: 276404570443f016c6e9aa4df18df8eb6c643cd9613495995fa431feb26e504a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://synerhu.ru/uplcv?utm_term=glaciers+meaning+in+malayalam
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081cfde0de15---3424669669.pdf
    • https://hzautomatisering.nl/userfiles/file/81188662350.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/nadalukivufigiraguf.pdf
    • https://dm288.rs/slicice/file/95182965669.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160749584ed0f8---44839105772.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/bedoxunixufigot.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/1ve82mo4aa67jauorng387mrk2/12913562554.pdf
    • https://basisnomor.com/contents//files/posebajaguxerajowawume.pdf
    • http://szentimresiklos.hu/upload/file/ponudexoji.pdf
    • https://giorgiosantinelli.it/file/vimuwozivobeloxazoratiwal.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b017fbc1bb2---68796205557.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ff9e2e496---83400800677.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/7b08071361fa7c3f6e4487d755c35239/nuruzugujaxisolezix.pdf
    • http://alibabashipping.com/userfiles/file/selelotu.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/3ef86e7762e9f2135a40a001c8c9ed29/78724384936.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/8d2bb06eee3675d84d6faef72e300ff4/lipegiwaluzunamajod.pdf
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/77278489545.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd53b63313---70019759461.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/8203gn86lipehktlf3vkhahb57/lejorif.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/59a6e9c44618cd3f67e7023f9ba5db56/10774692877.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b92434708b6---vodafafegasawimevetubuz.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/3b3809bf86d0ddbb936bb94b67ad4ecb/36864983396.pdf
    • http://andrelandberg.com/userfiles/file/76556339703.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9f98b7586---88460330380.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb22d3a514---22447067188.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016d84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D84 16792 bytes
font_01_sfnt_off0001859b.bin
1e1115086945f074590df1451748fea1605776a016a5bebdffedf5472d28e880		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1859B 10508 bytes
font_02_sfnt_off00019d76.bin
9e34442624f2024fb9413ef287688eeded996a056fb0229a3dc8ba927a7ead8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19D76 20628 bytes

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