Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2ded1c797746d2…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 02:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b91056efbc1207a148c96d03daa861a3 SHA-1: 03ee611a84197a4755ce05b0b285a90307580fe5 SHA-256: de2ded1c797746d2c66d1756f6bf170c77a587fe8b2f5c3b5a0af390182f1a87
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple disposable hosts, suggesting an attempt to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/juvusetif.pdf In PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/22061255640.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140d6cec1807---naxizorubovelosodo.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc3578c54---3491136328.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/96323320602.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/1129265716.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/nomomijujavorom.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/jikigejadudawesikewarok.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee09502ac9---mometugevifafutim.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_06_08_26_31_4847.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/84885918627.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/wolumax.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/sezefuzakulotonijesigog.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/sogifufo.pdfIn PDF document text
    • http://topflexsports.com/uploads/fufud.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/60716921559.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/vitaxu.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210916062407.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/51704393340.pdfIn PDF document text
    • https://limsurempat.com/contents/files/pupag.pdfIn PDF document text
    • http://etre-belle.su/images/file/nukamepevazasufenufoxuj.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/14695956849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=droid+serif+font+free+downloadPDF 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_off0000e3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F9 10432 bytes
SHA-256: 29d5ec20ff6631705bd663e208abe19d0e7c7cccd11e5c6593317b993ff6a5b4
font_01_sfnt_off0000fbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 18176 bytes
SHA-256: 470b876cfc5b389a3e6fb973ca86dc0b60275248760b839f61c59bdfa95856c2
font_02_sfnt_off00012a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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