Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ed4639e2a186b7…

MALICIOUS

PDF

93.1 KB Created: 2021-08-08 19:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 869f159e484fa98ef7394bb5c68b8d84 SHA-1: e3e58a1016f8ab52c3d4e2c48293d3248db816c5 SHA-256: a0ed4639e2a186b7b9a5d8e25138454fa13a44c36cc9f0bba8d26338ed01b327
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. The heuristics reveal that the document functions as a link farm, directing users to multiple compromised websites hosting other PDF files. This suggests a phishing or social engineering attack aimed at distributing further malware or collecting user information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/ebd5bc38787791d12ed086f6b5c614e9/vaduzeviwepumewe.pdf In PDF document text
    • http://abwplazaview.com/uploads/files/59588906452.pdfIn PDF document text
    • https://electroagro.es/pub/files/39881486740.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/riwavekerepepafojite.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/7135c05197cf0e9ac81c3b3bcc7641e4/26367571467.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/a7e3ae96ab4d577cea24b8b092d06de0/rolisixufel.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/24be7525984aeb85fb19afb244f96de1/depupurudixame.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828e1c42b87---86613996923.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c52db456723---67374723740.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/33520796765.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/92896698582.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/leped.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/dc64eab06008cea4a119714a0a21fba8/paratejugaranadese.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/92t5hc0v2c3lk8fjjnqkldjenu/25915651408.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86674573a---zajejipaf.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/53337736670.pdfIn PDF document text
    • http://didopack.com/files/tebubikin.pdfIn PDF document text
    • http://limoride.net/gallery/file/63579491183.pdfIn PDF document text
    • https://jurad.eu/files/file/14877642527.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/45325555695.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210630054934915.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/29889267710.pdfIn PDF document text
    • https://isosklo.cz./uploads/87299637474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=gta+5+kurulumsuz+indirmePDF 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_off00010549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10549 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D60 10712 bytes
SHA-256: b9f663efcff4277c59c6c8095bb370a436b543821a54d903c53c4860a61e1268
font_02_sfnt_off00013614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13614 19708 bytes
SHA-256: 4cbb544f8992777b587cb92e07a2a909a78f190f19c69c5132838d089ee47df5

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