Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80251bd17fccab1…

MALICIOUS

PDF

86.4 KB Created: 2021-09-05 12:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a4a1df77906fd5c2f857d9cd6aa1a0dd SHA-1: a33c89a4c2a33e38a040bf78ae4fa00e9be28d79 SHA-256: b80251bd17fccab1496e9e6703de5566a1e4efafdb28218ec67af5eec6b03eb1
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to compromised websites and disposable hosting, suggesting an attempt to lure users to malicious content. The presence of external URIs and link farm indicators strongly suggests a phishing or malware distribution vector.

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://nomylo.ru/uplcv?utm_term=rotulador+manual+dymo+precio PDF link annotation
    • http://www.edgartownschool.org/uploads/files/kalexunezug.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/kibironup.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a683a19b2---4631638455.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/fojemuz.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/dilifukes.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a95e83906a7---lopalowexesirotabukideje.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/c8f5509b694515261a5281fd5d717adc/57081613564.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfebd59afc---mipebolexezis.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/jakafubavoxopolunujuxor.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/waganazemolosolozuxitepo.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/3a3a5903f91bbead764f51fc253bb252/41277045303.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7e21e1846---junagosuronagaluko.pdfIn PDF document text
    • https://kawanmto.info/contents//files/2947713571.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/berip.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e97f2a320af---45690550922.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/mawubowewugimegorodeboza.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/28487448975.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/7b28ba1b2e54963bc7987853c68b6da6/1139212434.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/rinipotubimixixi.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210626_1E333143768A3183.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/zosakotetamarogezulipakej.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/nijixex.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/jamilazajisubegumaxuz.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/21745198491.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/ee7076c59f14e20aa0dceae1d78fe882/xomamujagi.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_off0000e5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 19684 bytes
SHA-256: 7011516c432dcce892623743edd9d0e1cf0e2bc529a682754b2dc28eb2ea0239
font_01_sfnt_off00011994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11994 10764 bytes
SHA-256: 2e1b9361f46d1154672ff4e263e57a647115ffd88b5fad4467cff1d850de4ea4
font_02_sfnt_off00013257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1