Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f27c63c286cae7a…

MALICIOUS

PDF

84.8 KB Created: 2021-09-20 05:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 90b4060f24921e30dc468fb8308f0e84 SHA-1: 53b38333678fcc8ae7339c5da6a5212c5a81cf7e SHA-256: 0f27c63c286cae7ad27cc5d882fd948b17f2532326414ec004b19b186df9cb6a
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 WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=game+fps+booster+android PDF link annotation
    • http://labsshop.com/d/files/bitugaza.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9d9437855---60752267597.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/kidetaxesoluzax.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/84556696840.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/dagolosiganubugajum.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/fotodupixesitafozewariver.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ruq7mu2i6nm2794q9m48shdcul/33487039776.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/49980141210.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/xidonetapa.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mezozesuridipap.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/zoleritolujidowujod.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/mowufusuruwurupezil.pdfIn PDF document text
    • http://cplust.com/upload/serback/files/20210918202839.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/53525698630.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/zopuviwajugalixobebag.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/48228421611.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/gatumil.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/bobawavejoxavirotobexija.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/90648901677.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/tidagalujujamudupad.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/39463772824.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130d50b14e7f---sazul.pdfIn PDF document text
    • https://pepsima.biz/files/file/zekajuwudek.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_off0000e33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4C 19124 bytes
SHA-256: 27e389f360a3bce810057094e1d9efd3685d004de2958bfb2aa97d5a894c7eec
font_02_sfnt_off00012d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3F 10792 bytes
SHA-256: 5545fada1ea205d9e888dc5f2b5b56aceeff6f853efdc91996874da4f96b6cf4

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