Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea0e7d47b9e89ea…

MALICIOUS

PDF

84.8 KB Created: 2021-09-14 01:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 687c386e42ce0bae26f9ea988b722fbc SHA-1: 68f2110f1959f0255cdaebea5cca8009e5c8bd2d SHA-256: 4ea0e7d47b9e89ea20fec6b2f402719ed196734fcec5718946ae8e762af10d68
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Several URLs point to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The PDF structure and embedded links are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aarhuskortet.dk/images/file/37829527527.pdf In PDF document text
    • http://sacoorhealth.pt/site/upload/file/48532100104.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/xabakelotevu.pdfIn PDF document text
    • http://schturman.ru/files/files/1271528790.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/4609427929.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/59575633791.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/19540265933.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/27642087266.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/1nhmdd0gaeo4mk4ih7drsttt1t/tadajitabasat.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/6eb6df6c886a28000402ad6e38de846c/perewufuvikojis.pdfIn PDF document text
    • http://etkenkalip.com/files/98571750254.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/jekezexekogira.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130db5f498c7---rafujekitukewapumilano.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/74f3d352cd29dd8527a5d0870d42589b/6380569678.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/95651991397.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2bb70117b1fcdd3899ff9e26aa606821/28386082620.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/12857583159.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/83446771318.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/xalizegibifimumilu.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/40196261641.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/wedefepupokinepapabiperu.pdfIn PDF document text
    • http://www.depomatrial.com/file/51744099783.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/98956647220.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/69887074700.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/54924562633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=demon+slayer+the+movie+freePDF 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_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 19432 bytes
SHA-256: bc2fa7281bc271606044ad7fbc78d9c49fa41f34988967b86bc99fe66814e173
font_01_sfnt_off000114d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D6 10660 bytes
SHA-256: 6d5cf8eb8e2b96755a2b9a4ca8514bae07eefb38a5f74cd45839b5f793c3d000
font_02_sfnt_off00012d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1