Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2a71f857ca9089…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 10:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 21de7bc9d672426733a494b9c00c73b7 SHA-1: 319730efee2bce99f1ba6f4e8a722bf2c596d600 SHA-256: 2c2a71f857ca9089ff41a19e6314ddb1ac3ecb622a442be0822019a9364d8830
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis suggest the document's purpose is to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://elfuklid.cz/foto/Image/file/10000663874.pdf In PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/gopeboxiweporibosade.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/bufivumawogijo.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/4fc5b9ed4c640f5855d2662ea9db66f0/saruvabo.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e05fc07a8b---66776037179.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/mefajanirexoxuda.pdfIn PDF document text
    • https://hiroyoung.com/data/files/291447088.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/jitokerufobe.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/14985931088.pdfIn PDF document text
    • http://seamacros.com/upload/file/77563791105.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/jimaxob.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/56db1531423049af30f0b28d7f0d213f/25988850212.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/zumokenowolalalatokabirel.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/daburepirija.pdfIn PDF document text
    • https://path.mn/userfiles/files/kogon.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/7485283038.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/pipusimaxupe.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133718f49412---wubibukewasavetitotitok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=minecraft+1+16+0+63PDF 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_off0000d140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD140 18032 bytes
SHA-256: 6bdd92b603be4782d1972355c9b6aae700036a10935a8234cb54b8e587109cf8
font_01_sfnt_off0000ff18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001172f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172F 10500 bytes
SHA-256: b01f39041a31cd20375d26e77f898a3f8eed8da28df0a897f0f11b0955f8b2b9