Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3f6c201d5a718d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-10 11:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8670b3904a48a2f41f6da30006fe664b SHA-1: 35d1adea698b05a9270aa9027e7750b0e7a5756c SHA-256: da3f6c201d5a718dd60c9a42da145af0a50825e52ca4aef9212bcada9ff8f94d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics confirms the document's purpose is to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://mywayrtk.info/userfiles/file/rimuserawejega.pdf In PDF document text
    • http://safarang.com/basefile/files/bogen.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cdbd6d16b---zoxalupu.pdfIn PDF document text
    • http://pjteam.hu/uploads/nufonesinemexixola.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/koporimosativupojemewet.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd03c9de92---21810158106.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/refetobilojiwalazef.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/vifovolunukadolexata.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/ribekamijabituduruleweva.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/vinefukuson.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/xurizokadaz.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/45541189569.pdfIn PDF document text
    • http://chongros.com/userData/board/file/88857988572.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/gibomajojenuj.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/4323699813.pdfIn PDF document text
    • http://gr-chem.com/upload/files/pulabenoxexapafewodegup.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/13184616395.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/fcf5e771baec9a93260a51007f6c78d9/sutemaf.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/5ilbqbg65dal2i6j1fnnljisvc/wodazesemuzalufaxew.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613591400273a---98634871572.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/kinitajifo.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613254D37D250.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c57e427cc---97576681445.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161337b14e8bf5---zenolisezafutewarowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=123movies+yes+dayPDF 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_off0000d50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED20 19856 bytes
SHA-256: 8090996ac1eac6d0f694f1e0579b8b9df51818aec56bcc83fe7fd642a92329e8
font_02_sfnt_off000120b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B4 10488 bytes
SHA-256: c0e8d32713990fafc9691a2d764c210eaa7b00312aa78fdb34a2f52c605822f5

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