Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5ea3155e29175c…

MALICIOUS

PDF

68.6 KB Created: 2021-09-17 09:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e54ef9dec262eac836a9590790407941 SHA-1: 17eb947f2620e3fc30ee938766f07531101936eb SHA-256: 5c5ea3155e29175cbbe437f8eaae873af36a039de5af2ddd74ce0fea81a0dec4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://medvor.ru/uplcv?utm_term=force+dark+mode+android PDF link annotation
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/50705084294.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/vutajabuzuxijojanutidu.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-12/20210912100003216508.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/14810819539.pdfIn PDF document text
    • https://eventaipei.com/upload/files/69490027128.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/lenafisolowoxitam.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/1656346645.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/534857bb17ff48119461d5d67a77d33e/fikukomuxogujufexavo.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/200507005.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/nirofumenofeke.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/4ftaldtcmg1pak3ka67c5ilcf0/20959933168.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/57673881448.pdfIn PDF document text
    • https://masukpt1.com/contents/files/motizemisofejulinopive.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/naxozonewakujuluxexok.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/90004263917.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/8803896386.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/lasegadobibokorepamiz.pdfIn PDF document text
    • http://winso.tw/userfiles/file/xoxovoxonanakasikolum.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/df5df7c94e1d7e344d1bab4b556d1a1d/6630865346.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/92088968225.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_off0000af1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1A 15264 bytes
SHA-256: 4122267be7b5333ccbad1e4b4cf5d8054164ea16b8832bf3a27d61726560d9e4
font_01_sfnt_off0000d62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62B 10288 bytes
SHA-256: b71dce4eedb553da7e5be7331814c2cda501772fce889ddbca2f9d065eeec3d0
font_02_sfnt_off0000ed3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1