Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b74594cb00d4fe…

MALICIOUS

PDF

86.2 KB Created: 2021-09-16 16:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3008631620067017438dcb471d3bb4e7 SHA-1: dff6fe6f7204199be3ab67d6d648e56c12cc7b47 SHA-256: 49b74594cb00d4fefcf90eed80ce2d80cf831f71f421df288911f6e9642b083a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic findings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=pdf+5e+player%27s+handbook PDF link annotation
    • https://hankilfood.com/upfile/files/34841366055.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/pitenawoj.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/gemitumetujowe.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/xazijofesipumitupumezopud.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/tafilolenedidajep.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/xanapopuvagorogitevadi.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/54341193660.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/6508845311.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/46513116952.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/0be996973101e48dee13f2102e8de595/53513860144.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/wononepixidujo.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c7c0724cd---20118709946.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/xavidazixume.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/wowuziti.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137890ee4613---77164245292.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/20226388438.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cabbc2715---67036422407.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/redusoku.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/43863531708.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/beranunoriwezimefajolop.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/naxewefibufisezizi.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/44310904903.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/42236641019.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/92595141948.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/zevizofuviviwuwonejinoxi.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_off0000e6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 19340 bytes
SHA-256: 33e49469699901402c39d1de6bc64d796f9452f46c3dfbd874b63903047cb047
font_01_sfnt_off000119a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A3 10920 bytes
SHA-256: 16b93e9c1d376c6c3730699f93ed7d4bd6a3f89e34444240f88eefa787091023
font_02_sfnt_off000132c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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