Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83caf15e81f5992…

MALICIOUS

PDF

86.9 KB Created: 2021-09-01 13:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2262f19e91f963e7b9b431092a330d17 SHA-1: 49627c624f9271c577b52386187019cdc2a3c2f9 SHA-256: e83caf15e81f59920dc51e69e24b4485f7cc3a6044f0fb359ca524f1438d7353
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate maliciousness, with the embedded links likely serving as the primary attack vector. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a509789936---10105497408.pdf In PDF document text
    • http://kechengchem.com/upload/files/99760711581.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/15359080308.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/dumomerawutudop.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/gibetanivug.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608125c66dfea---46838458669.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/hf4dn6411ncsi36f3n33cg5p5v/43103518259.pdfIn PDF document text
    • https://dm288.rs/slicice/file/rutomafil.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/dojogulorexukawu.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/55471424437.pdfIn PDF document text
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/dabebovusaguk.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0ff5dc1699ee61e3b79593e05f1df36a/pinazeromojitokoxu.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608944deecaf1---94300797588.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/nejegijepulufagesuvuju.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160885d8f5dce9---20107417941.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/sagulu.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a2e3912dd30f72d3254ceca7cb4942c5/tokegokoji.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8337cb914---97784015079.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e7d3a055f---dupatusoxitobivujatagox.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/68113008782.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/59686899543.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/dikenizasor.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/borexitisomifovuzuwejoz.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/cf70b22aab2e1820918d8fd67b803dab/falejorisu.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/27867019500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=anthem+chapter+1+worksheet+answersPDF 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_off0000ef12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 17492 bytes
SHA-256: 399635b72cc013630f2d99927c4dee18410465c64a43565bec286f11f4758225
font_01_sfnt_off00011c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C35 10712 bytes
SHA-256: 3a66760f3e85772bd036c7498f524a82d1f0168d80f6be40731c33648e234e9b
font_02_sfnt_off000134ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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