Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6331e417b8a9136…

MALICIOUS

PDF

108.3 KB Created: 2021-06-27 18:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d83e533e09c1606060c9b2541440f349 SHA-1: bc452db247de7a113a628dd148abfc92fd5d3edc SHA-256: c6331e417b8a913612a962f1c5733b0cf0d0df1b5c4bed8af4a37c6627922791
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to host or distribute malicious files. While no scripts were explicitly extracted, the nature of the URLs and the detection names point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/efb3f5beef43231f3cb90cbf84ec71e8/65364334579.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609012cb3cf10---tetejupoziredifibow.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f334fa1c926ded16ca5482bd8374cb76/98103049618.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/35890e886f8c11499eac582c89d294bd/tipaz.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/acd302ef794d2ec6bbb9224b7e84663c/56575656124.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9ed9d3b6b---gizegilazo.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b062a81d245---95548129739.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/jhh2ktrnqj1r0ppd9uc5tktqbn/65873464911.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608166e97578a---resuwajusupoba.pdf
    • http://bajcsidavidfoto.com/_user/file/48414915920.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160807a22d8008---lexitujugu.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/1ndc61beeqi5c4h6c0tj2k8o11/fijigozizifusitovas.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d69c35417c4---20020966643.pdf
    • https://aviseco.ro/userfiles/file/70848451661.pdf
    • http://mav-auto.ru/images/file/3954662719.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c771379d870---libolukezigatigijigokit.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd1bec941e---8057799728.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093a34e36f4e---59972951603.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607df1327fe53---95297425558.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8131c1ac194d53fd9fd16cde98dbc424/wefetimomuvinilepaxeb.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/sjsvhnogg6qbrm9ue9vo69lf1u/bezolerijogetulok.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba65dc472a---10304744130.pdf
    • http://gernano.eu/gfx/userfiles/files/bibafusopejatobonitigaboz.pdf
    • http://saltokisport.com/uploads/files/76870163604.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/1e24fced1f13f95799f264996a18bf5a/15103190851.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=connectives+in+arabic
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00015589.bin
4f240e3bc6988ad7ce295b0f66ba264306aba3ca9737dd3feaea22723329a1a5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15589 30008 bytes
font_00_sfnt_off00010e72.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E72 16792 bytes
font_01_sfnt_off00012684.bin
3f3848b660d38d57bafea4413b55c1b1030adfa653c4d7b7a0fe7e618b9fd067		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12684 18540 bytes
font_03_sfnt_off00018b8e.bin
97304c4e3dad053ca0a6d7a61fad0a1c08ac6e7890c598d0ed99a954ca522924		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18B8E 10416 bytes

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