Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff5636e809b3688…

MALICIOUS

PDF

86.2 KB Created: 2021-09-05 16:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 44955e6628819ff3963e3b432b594509 SHA-1: 8c115b3abcaea3c16c4055913b88409f5eb6a73b SHA-256: 2ff5636e809b36885201b07b93d845f91058c5bf2d9df8ca96af98bf5a57e468
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many pointing to what appear to be compromised WordPress sites used for hosting files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure the true destination or host malicious content. The presence of multiple distinct hosts and a high number of links per host further supports this. The file's purpose is likely to lure users into clicking these links, potentially leading to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=nelson+mathematics+3+answers+pdf PDF link annotation
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c064bb2ee44---22044812582.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160f021d1b245d---65972191660.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/juxuwebujitudewujimijufon.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161168842126d7---derirubinenuxumuluzom.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/54104129928.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8d37479db---gidaxuguvivewudasi.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/tibisuk.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f09ec31633a3ee1294f7dc76236863d0/xukorasuwironalopoji.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607baea1a28ac---84853122527.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/716gqhtki1hnv1k0ogh0tgidrr/zotijesixobutowa.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b52d0c8caf3---27717405215.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e958f4e303---66506168518.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/90188210105.pdfIn PDF document text
    • http://4bx.pl/public/file/66736004240.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/2rjg56p77d13aqjv44qriis984/53391388221.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f350774f8f0---vixirakezezitomewot.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/zepifalotawifixanagozifu.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/82962009458.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14a3f3e2d7.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/guwaginobufutur.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/10154947069.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/zugikofogatavodunosomet.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/gizikuvofobedewajedo.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_off0000e7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 19116 bytes
SHA-256: df3e07d4b64d5bfa6b95c336c91772c11824b904fa0399c81ec1212883b32d8c
font_01_sfnt_off00011913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001312a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312A 11120 bytes
SHA-256: ccdc81ae0cf769c63a7456039ac1d6acdcd0365a4c59c9b188505d88a37a468f

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