Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4eae0ceca81e8e…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 19:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e4f7086bf10e1cc5204e0298c3ded4a9 SHA-1: 99250b3e94a648f3cf5ff7251a3c84522acbce8d SHA-256: 4d4eae0ceca81e8e904688f1827cbd19fac7d5a787a7327dfc74a518d7179e3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=how+to+stop+android+system+update+in+progress PDF link annotation
    • http://lesen-und-schenken.de/userfiles/files/gekefutizezazif.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613df1ba1b543---70910175131.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/460c562158f6a7052ff71d746fd322b0/jonaniwixuvonaziban.pdfIn PDF document text
    • https://geniodelweb.com/file/nekofixasijovozenala.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/n2hsm9ibs75chssq9q7oi6e0fi/48187198623.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff9a16e20d---51400221391.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/jivebutolepodatut.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/dituvojivogi.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/38539649442.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/miwujagamesidijixolibule.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161409456088ef---xidiraxafasazekosabu.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/gilidagowotiruli.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/sovaxenirebedivegor.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/72747803226.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/4493499096.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/51801009086.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/47539344323.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/23833987948.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/92613016534.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/butivejilubitup.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/kotifatoxamumozewo.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/nejubugodelulufozonasixib.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/gejiberofiwix.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614204bf011e1---lanov.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_off0000b913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB913 16252 bytes
SHA-256: 7ac4d33111cd867c433a3e0036b45314d02352b882ae4a3fb6b9a6b8d4eb6bbc
font_01_sfnt_off0000e3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBD 10980 bytes
SHA-256: 22dd9d5ce404dd3d7eb290e74389c9a40772c66b9837f9db5f3091fe6fb5b357

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