Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ec8f379c6ddefd…

MALICIOUS

PDF

77.2 KB Created: 2021-09-26 07:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a22b53213ac7b3bd37a570180bd32753 SHA-1: 9adecd77401735dc232170e42533f814a2c95616 SHA-256: a8ec8f379c6ddefd6c06fe6f568d49572eb8072a0c8d0d878c681d2e2f154155
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting it's used for phishing or malware distribution. The presence of external URIs and a link farm on disposable hosting further supports its role as a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/i1s5vvp7hkn9u68golfnob2u27/72184657838.pdf In PDF document text
    • http://lotusburbank.com/uploads/files/katefulufexufilekasi.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/mivuvazarofefesisi.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/rojolebaxidozokarumab.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/66623835337.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/gufiti.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210922162640.pdfIn PDF document text
    • http://gaudi.tw/upload/files/wejemavoj.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/487909149.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/radapulajejebekovu.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/woxikure.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/80441838843.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/ruwojiz.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/76859593166.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/sazajifodoxafamap.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/notisiwike.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/mipumeredomadux.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/10891421901.pdfIn PDF document text
    • http://slovoveri.org/userfiles/rokugererosujubumalow.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/23755166833.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fd94d1489d---51595973057.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1614404d13d8b1---42323499384.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/36e233412aa8bb7549059bf1185b965c/fupazazafif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=carcassonne+android+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_off0000c193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A5 20400 bytes
SHA-256: 9ab65b1e0f4774359c191a881cbf5bfc77cdc5db6f30febe768056b0b18cd69c
font_02_sfnt_off00010ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECC 10488 bytes
SHA-256: 78c4e64e855b935d2f7323d4c56cf5cec17cc83034607346a5e77385a1f47c7b

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