Malicious PDF — malware analysis report

Static analysis result for SHA-256 108ab7afec41a315…

MALICIOUS

PDF

93.7 KB Created: 2021-08-29 20:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f3473b6bfe21b226d8dd2dbed6307c3f SHA-1: 6f0132fe5c11967ef6816a653d4ff2c5ad58b4a8 SHA-256: 108ab7afec41a315b8701fe0037dbf7c270413c53fab78d633af1de23cd36ac3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the detection indicate an attempt to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://amirafouad.com/uploaded_files/file/fekolorevujeto.pdf In PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48b41d4b17---44947936339.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/31960653489.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/nonizarobujoxojelosegik.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611b049f594ae---51705656975.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202108190144506360.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a20d2cd8b22---wofenipugikimolutokabi.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a2244c96f2---jojadodevaroxonudiwo.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcdb3f176e---wunamusabuguxupimabuto.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/97437816729.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/d97b42f8f7207c8285314b1be75cb897/fogavode.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/wilafizop.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e3230c53---93730370627.pdfIn PDF document text
    • http://emannsltd.com/userfiles/lalonuwene.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/34077373630.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/mutifato.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/56746294192.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/dqoqa1re58qoa6sa84fvoep97b/5476039132.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/vivunisiwoguvavivimadu.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acff4ee15c5---49008157448.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df0392867bd---48159701192.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16108e832ab82f---37133863742.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/80499336557.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cebd12eae1---pijupagekinasesumafujijax.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/39344012751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=do+you+put+a+comma+between+street+address+and+cityPDF 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_off00010758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10758 11068 bytes
SHA-256: c6e2eda7d4e11ba96c064a3ce5bce5098494eb6e99a2f279f1fc5ec75cc101da
font_01_sfnt_off000120fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FE 18280 bytes
SHA-256: 81d9b9fd8a8c13e099a291dd1ce0f257010e20dd66abe8b5be0c86376502784b
font_02_sfnt_off00015065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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