Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c85c60cc827fbe7…

MALICIOUS

PDF

77.5 KB Created: 2021-09-05 14:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 061ce1196f7355f4d58642501a5e37d0 SHA-1: f24aa8d225df6acb095c17ad2369efb86c54d995 SHA-256: 4c85c60cc827fbe7e2db2cede3b6d56787dfd039c4ea6db48b5eeb22adb74195
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, some hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://parkhighclassof60.com/clients/871169/File/11219680910.pdf In PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072e1ff47b10---jipiri.pdfIn PDF document text
    • http://yuhongzg.com/d/files/kenafowutibofoxotoxakelo.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/lajopivadinipuroxov.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bb8ba511e---42103301167.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/75201958173.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2ceb4e1b6---41499383849.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ua1hit3ghfkiikcrgdqji6qim0/80238362518.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/84890362092.pdfIn PDF document text
    • http://stadiumhighschoolclassof1965.com/clients/0/00/0080f9a3d0f10e930bcfc39f0a940e94/File/48487366715.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/91853992069.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210623211145.pdfIn PDF document text
    • http://live-net.it/file/mafedisira.pdfIn PDF document text
    • http://slsnn.ru/content/file/99370049655.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/45996111811.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/e30ab740edade59f8b067c827d564b49/92421939684.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/nilutopedefumagutejiterig.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/31791397371.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/87120951731.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/vineguwev.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/lewedarinozoge.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/77331131269.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/fegefukulofo.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/87600965106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=p+nath+physical+anthropology+pdfPDF link annotation
    • 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_off0000c877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC877 10884 bytes
SHA-256: f87906ab8af4e2f6fe18795c3b9feb118ac97954a4b838911b63e28e6e88f63d
font_01_sfnt_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 17908 bytes
SHA-256: 972f1b53385ba0ea91097c11a2d01f7aa2a903700d4c4e45b4f748a1ef9d0204
font_02_sfnt_off00010ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1