Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c2e46c9171659e…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 08:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 08734fc61ab94246dc782d84a2031ddd SHA-1: d41889fc877ea202490d75472489e42c6123f345 SHA-256: 20c2e46c9171659eacdfaf2e78b683fd2f125ae6ca8c1acb5b41965bdfd2b164
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised WordPress sites. The presence of numerous links and the use of UTM parameters suggest a phishing or scamming operation. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://chcial.ru/uplcv?utm_term=dr+fone+android+recovery+key PDF link annotation
    • http://pro-customer.de/userfiles/file/xagap.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/37821674776.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326cef8179d---bevelegavepabazogagat.pdfIn PDF document text
    • http://sin-hua.org/userfiles/52408022590.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/1096208838.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1614324663ad64---59895958673.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///56388383386.pdfIn PDF document text
    • http://jawarakreasi.com/file/wipemaneboporobinerabob.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/wofijitofe.pdfIn PDF document text
    • https://majubesar.info/contents/files/galotupovenojemefajula.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee6a0d1806---75613962326.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/21805322878.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/75770337245.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613876893337c---tenikim.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613067f464f54---76618292732.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/33527230803.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/58205731617.pdfIn PDF document text
    • https://chilepools.com/contents/files/vesujusafuve.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161391896d3825---9954160481.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/ramizuma.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/jagofozeradejadebije.pdfIn PDF document text
    • https://granitnet.hu/editor_up/sameveziv.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/xabizem.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/wafepolu.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/gotididavo.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_off0000d635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD635 17952 bytes
SHA-256: 48b35694212d35eede0bade9994bd7b35b484042201866e627b647b1e4a95ed4
font_01_sfnt_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D38 10428 bytes
SHA-256: d6c8ec265186fda85d0db11ae3aa85362697d3c34608323192258c1fa83ae6fd

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