Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5da62bbf21d5bb…

MALICIOUS

PDF

86.9 KB Created: 2021-09-12 20:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b8d4c43951c4e8f7ad99b1bda486a4d3 SHA-1: 8b39a54c5e7c60578000d840c005a508446a971f SHA-256: 4d5da62bbf21d5bb5a3f82a4316e02c2fb7a918b5ec7861bfa79b9cf60efad2e
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were extracted, the structure and URL analysis suggest the PDF's purpose is to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://dhleisure.com/ckupload/files/fenevezusivib.pdf In PDF document text
    • http://viettranslators.com/webroot/img/files/16040530360.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/57159640596.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/tibagudoninawafedepesik.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/82580300634.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/545a575c8c58cee49f2ed4bc0b620a76/gifotixaromutanurebe.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/vitakepajumoka.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/61567634358.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jodiz.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/suvezuz.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/majalazonunezija.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/dutuv.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/36173182254.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c7c0724cd---20118709946.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f123f22ec68252819bcb1e65743607b7/gupukodizuxur.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/43929822565.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/72941904620.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/zujexapudexafogajobupevig.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d60411ad53---kariwubivanul.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/93108057806.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/86286800088.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134ba430bbfd---vadazuvuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=firestick+movie+apkPDF 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_off0000eda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 18544 bytes
SHA-256: 84c6cd4c7b0d36be44e27e9d39799ed44a7a958fd37aea0d099943ae0998d857
font_01_sfnt_off00011e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 10520 bytes
SHA-256: d5dd1fd4e4b4144ea2000b8e3e889f30fa26db38ad265762fe84a45e7675135f
font_02_sfnt_off00013621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1