Malicious PDF — malware analysis report

Static analysis result for SHA-256 4919cc910e534b1a…

MALICIOUS

PDF

88.0 KB Created: 2021-06-29 09:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8cf031c46b95b885667985cb8e91e599 SHA-1: dfeac545fd5a0e9c9e3d8fb8a6696bd69d45a7af SHA-256: 4919cc910e534b1af22b8ae65127c1d886756555ba12109dfd297eea251fe33e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://coretry.ru/uplcv?utm_term=excessive+burping+in+the+morning PDF link annotation
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/c1b8308054db8f5b4440b35eed6a790e/42968082237.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098365a24d92---74622221740.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/37016880303.pdfIn PDF document text
    • https://telenovella-bg.com/files/tubenuve.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/pig4vqj2jd7crt3s2o9nf0a5b0/geriletuwop.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c9f32f963d19f6bda607872f012fc8dd/47030540537.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d35844a6160---84313546049.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/27817919035.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/ec9209cc685c7f1afa897904b3657069/31268500174.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/85310927989.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/dasuzulafizixojo.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/naxokizelenasibiponiwori.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/9on6kq0sc2qbki3p0cb69ovfk3/wesonov.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ad01375e055337baf1924466ae9b8a89/wenonorudeve.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/17176263663.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/pamupujome.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/1281543fd47b6ece4892e208948c98ce/dojefes.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608591ed8a8c9---teneda.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/53537704976.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160771e38de973---32994129132.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/fa23e0e1943956d1818e34dcd0a4c2d7/jepejeve.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/05b009cbf0278191a63f0ed2088799e0/fozumezaxujagedonizewov.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a97cca279d6---32039160824.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b9959e0d4ec9eb0db6fd5fbf83988c10/wegod.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babdfc1fc4d---feguzudifigevobo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5eda932e1e---zolalefugo.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/61275559632.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d5e0c434c---disasizekavozuwakejipaje.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_off0000f2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 17532 bytes
SHA-256: cdbda37b8ee1bb13e6a9a96e5fdc73fdfea58c43b980a8ce3feb2c45e1b250b5
font_01_sfnt_off000120e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FE 11004 bytes
SHA-256: 013dd71ca038237c7b45dcfbd93e22daa6de06e825c3f466cd632db72d21ab27

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