Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad997aebb3f4976f…

MALICIOUS

PDF

90.2 KB Created: 2021-09-04 06:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 8ea63e8ed44fe1199db5d9713c1009f4 SHA-1: 24ae8c8e98fc83456b2ae433ca5020219edfb4ae SHA-256: ad997aebb3f4976f6fffbfd0de8ccfac6577b25a425786fe8b2a8b8d1a48fdc3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=hipotiroidismo+y+embarazo+pdf+elsevier PDF link annotation
    • https://bulgariapools.com/contents//files/wupesejadetubosemewoneno.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8d2dbfde8---59916123914.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/difital.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/46720578932.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/kimewawoxekedinujujis.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210703041056.pdfIn PDF document text
    • http://asqcert.net/files/files/90208741546.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/iomllv9e0p1jb3sgqi2i4u3mjt/2643416966.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/4368c8b840db87f9ee94ad7b23e5f31a/35432269519.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/xufobojujipuli.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a1fc406b31eece362d9b8ac3add5de06/rararagezevafewegir.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/61582851740.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a603f12e8---25726143215.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb1590c81a---50139956587.pdfIn PDF document text
    • https://miet.hu/kepek/pugamu.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/kumawid.pdfIn PDF document text
    • http://aimic.com/userfiles/file/kugajokusexo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/gs7dt2q0s32dig2uus6bmfs006/10400845132.pdfIn PDF document text
    • http://jarosi.hu/files/file/93967193191.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9c5d4d765---66164976927.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/tivepenokoxototufabavura.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/63042476612.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/38558435014.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/29901032211.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7bb9e7967---jibebajonewuwati.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_off0000f777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 10924 bytes
SHA-256: 691879416ee3ca36182f3a21d3b356c0f47041ba871cd6795aff951e41e86982
font_01_sfnt_off000110a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A5 19680 bytes
SHA-256: 866dced25206102754da44660643fce49981467d014d423118b534e76c95e71f
font_02_sfnt_off000142c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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