Malicious PDF — malware analysis report

Static analysis result for SHA-256 d942c63eabb4efcf…

MALICIOUS

PDF

75.6 KB Created: 2021-09-17 03:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1f1000145c78dcc1aad14940de49bd9b SHA-1: dfb4b983ceb51cb24dcc9312d255b6068d802445 SHA-256: d942c63eabb4efcf90d66d6bed3c73707eff80860c605bd2a6aad6e989adca42
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=iron+man+live+wallpaper+hd PDF link annotation
    • https://decisionstogo.com/fck_image/file/jixiwevokoliwadowatatono.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/godeteruxixigidi.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/38646638037.pdfIn PDF document text
    • http://videocycling.info/files/file/41062692726.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/fadejijugabasivumes.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137703f69c59---pixek.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/tinewosilosiwikonirowoduz.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/pivosamulejexixedobude.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/fenubobekemomuberavopup.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/48793197604.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/61195968932.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/90128207723.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021991955252405.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410214b19e6---3244792061.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139191b84343---rujudodafuje.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/dadexufimonusenaxunigero.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f871fd7d8b---mixowegobujoxegotovuxepax.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/94185384553.pdfIn PDF document text
    • http://koala-al.com/d/files/juwadijivakoloripowab.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/zedur.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/27451936396.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/fipukopewofora.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/vepedinet.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/notalerirumagipiso.pdfIn PDF document text
    • 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_off0000c5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A5 10496 bytes
SHA-256: 638e358f62a31cea093ad428d5c3a05f80386cc79b409992153028399378ac8a
font_01_sfnt_off0000dd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 16956 bytes
SHA-256: ebfb73916d15bd8890a5ff94b49698bf4f7dc1cbf223970145119ed3a89e31dc
font_02_sfnt_off00010908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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