Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb991ff9965dac10…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 07:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f262fe4c209da8868a8248278a06aa2 SHA-1: 4a9314983b9f12a7a044c0b1427df38e39a71a67 SHA-256: cb991ff9965dac1054c3d72f4a957e7b947581b40dcddf0a62bdc114276b0c48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces this. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://laborke.ru/uplcv?utm_term=caller+background+for+android PDF link annotation
    • https://groupburuemas1.com/contents/files/zuvuwagunuruvofaxenix.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/76715620547.pdfIn PDF document text
    • https://protum.se/file/92279690135.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/galemebaxanidimatusom.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/tenibupabobuminusika.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/pdgp5k62dt8cr8r5nuhh1v8miv/91150866633.pdfIn PDF document text
    • http://isitekmuhendislik.com/userfiles/file/71991677760.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/51494263779.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/kazitarebijizonadumuvi.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/69577402422.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/25812249051.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/upload/file/jevomozabesadat.pdfIn PDF document text
    • https://digireg.it/upload/8833275370.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/bamox.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/vozinit.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/38183311996.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/71257748779.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/bolagofawalulesalazi.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/9740925614.pdfIn PDF document text
    • http://belv.ru/userfiles/file/disipujubajitujozodinita.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613443f6eb8e1---dakatudurotifu.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/68706925310.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/58517295071.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e528256b98---zawasodonawur.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d8b1e6cc---belujorevakuxojulo.pdfIn PDF document text
    • https://attack.lt/images/files/mixawulagurexopefixose.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_off0000d26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26F 16936 bytes
SHA-256: 5b05c30fc581b0d2763dd212038495845220a34f6a1bd83399b3a25c1d0221ff
font_01_sfnt_off0000fe61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11678 10748 bytes
SHA-256: 60aa0c8eb5e3f10ea8e5717b4f1723802e1ae6912f921b4af6b947cfa58e9e3f

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