Malicious PDF — malware analysis report

Static analysis result for SHA-256 664d10b59a17d00b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 09:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e3844779e945d8d0ab2eb790ffd75b3c SHA-1: d186b9ffb8fdee5aa9f5e009b0a82745c52c4407 SHA-256: 664d10b59a17d00b8e8cc45207db2d05307e5ab431ab768b2f319c9a06a1dd0f
156 Risk Score

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF contains numerous external URIs, many of which are hosted on potentially compromised or disposable domains, indicating a likely phishing or malware distribution scheme.

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://szjg.hu/images/file/876909795.pdf In PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/64939109595.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/85985504558.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331f333477a---juraxof.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/963705286.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/37471666731.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/97209785062.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/kebemoronurigafaxulafegi.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/buruxokisukebexubi.pdfIn PDF document text
    • http://henca.com/files/details/file/56048873392.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/19892566227.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/vefujomegejibasurelav.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/90153949539.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eabc87fd659ce15044c9bfe775f5996d/vesivevebi.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/2ee96bccb30240b59d5c518908a7fd1d/rudetimevezobivutalir.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/25075151846.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/9524369269.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/janisuxakizowuzazezizina.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/56014144554.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/laziwemezo.pdfIn PDF document text
    • http://pedraferro.com/files/files/20126495433.pdfIn PDF document text
    • http://secretinvitation.net/images/files/79378287383.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371f4f53cf4---pukopava.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-13/20210913191903926686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=gujarati+story+book+read+onlinePDF 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_off0000d8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C7 17896 bytes
SHA-256: aa1b50bf1642bb6be9ec08941f38b5ca1691b1a71fbd77dc1f1087d0630cbc93
font_01_sfnt_off00010744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 10856 bytes
SHA-256: 9698b146b49209498a0ccf4242dce0ecd2db9f7efcdc54a8465aaea97f3d9405
font_02_sfnt_off00012076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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