Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68aedc09178f015…

MALICIOUS

PDF

92.9 KB Created: 2021-06-30 04:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e87719bd9b439e42450c343a61250f8c SHA-1: cea67207103c2b397181e04dd73825a608aeab2b SHA-256: c68aedc09178f015a556fdd3cf7ffc609aae1c5822f8027afdc0abcf277b1097
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malware or lead users to phishing sites. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083123087acb---2580257469.pdf In PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924a3f5593a---vobirovow.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/zebegol.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-13/20210613153335891775.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/43356540653.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/jamebisepapi.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/nalelu.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160818f9a8b581---kopipevujexerunidi.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/7e156608e4a0505faed6d9f8cbee63ff/fomedubeminurifetabiwidod.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23c2251419---tuwewudalik.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/7f49a9d0847d3aa467b45dd798aeff15/20367912707.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160834d0d426d0---majipabowez.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/xiwene.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/gawosunetota.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/233364d90c0d2e6aa3004f51aedd904f/28787502117.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/38792267683.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/44819113262.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5bd6bacce---53815670900.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e497724184---gobufi.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9429a2cee2---tapomebasowepipeno.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/14188086841.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/md5npn8hcoa5vkio0vk4du1qo0/47579279661.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3943fdb06d---damowumapisoke.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/3460a34409805d8a79463a59f17a04b3/70493514738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=parts+of+speech+and+its+definitionPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b6a5ae894bbd44eb2e592dba8b168225/87992106761.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_off00010743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5A 10672 bytes
SHA-256: 4e41ca3894978bd7adcfea69e0167b2ba3b2fd5cf4d34eb81f5bf2122e36cf47
font_02_sfnt_off000137c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C0 18356 bytes
SHA-256: 2689b8b161d7ec86e5bfa578c940e2394d481b6f4df5e22c67c83f54e0b6314e