Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a8f4860eb8aaff…

MALICIOUS

PDF

81.9 KB Created: 2021-08-24 23:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b53751fd597e889d6dfdcd387522a4fd SHA-1: b2b22509d8bffe426a20a777da85c10a78475179 SHA-256: 20a8f4860eb8aaff7c7229934e95ec5094f92af94acb56293a569bb33ebbbe4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs hosted on compromised WordPress sites and disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple external URIs and a link farm structure indicates a likely intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://aircond.md/upload_fck/file/lokorudofopamuzapabi.pdf In PDF document text
    • https://ienter.bg/files/molitodupejuwa.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a382ee1d803---larewibamawulikire.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb5a6ecdb0---35010847639.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/a70cfc24f5e17fa8e3c46a7379d97bd3/54400862445.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/43860222655.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/10f3b7db1f46f05a959be6cdf63cb469/50420722012.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/fajotuzogameji.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/21410062824.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160932a0c36908---nojebafalidaxurumexum.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/08a3d0686af2de2c87efcd16f0c37af3/wesesaz.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/bamatuvewitunolo.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/91962396026.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/75132572357.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/ralowezupu.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/17447326291.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/5777ea8ddd0134fe7c568141d5c836e3/67261854201.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/72136529855.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/bogetijugogufebi.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/60692928218.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ebb7a16a34a370204dc47e16b11e38c2/26765516963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+is+the+national+language+of+belizePDF 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_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 10684 bytes
SHA-256: 8a4763cb09bea70b2fe7f41dfff7cce7a1de5609a6a2c52649d7caa8f711e59f
font_01_sfnt_off0000f5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 17052 bytes
SHA-256: 70c34f2fed038a9685905bfb784a410c99dc7500b7a6ae745e322961d0d9e931

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