Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2bcab57c2db14d…

MALICIOUS

PDF

72.7 KB Created: 2021-09-01 09:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 571f21c28477d289fb00e139f945304b SHA-1: bb8b470e91bafa0608ce162d2d6fe0cfe85f7576 SHA-256: 7d2bcab57c2db14dbced1471c6c5817616d11f27b7c3114280738d122a7f1b98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URLs, many of which point to compromised CMS uploads or disposable hosting. The embedded JavaScript likely facilitates malicious actions, such as downloading further payloads or redirecting the user to phishing sites. The extensive link farm suggests an attempt to obscure the true destination or to leverage multiple compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://oniceh.ru/uplcv?utm_term=pied+beauty+by+hopkins PDF link annotation
    • http://epoch-making.jp/js/upload/files/kuxosinoxefazigumoz.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/3598701097.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/86613160505.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/8e0791b5386b19b00a173d20df957b18/92332210686.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/32084457603.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/13066671979.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/faterewijapibulamifo.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd4087d6dd---gabolodezebenifofa.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/f9c1098024c723765234523f40dc925b/49677235872.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/gasajozemeranulor.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/74604424000.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/mivedekazujoxizawenelabav.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/sililojanivunije.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/dukisuki.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608319fb30884---foxobexufewuruder.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be081d8fe5c---zemenotopazele.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/47569ccafbeb46a025bf676ffb3b406d/nasivanofavoxuvimopitufuw.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cd492927c---xidibamesumumevogotukim.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/bejofajofefolumup.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/gepozuxotuxojugatizij.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202108300802012654.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/xipuzesolifufawudojil.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/rufapifewopuvobulagujoxid.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16082c2c7d7812---75192866455.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/42432483344.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_off0000b798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB798 17092 bytes
SHA-256: 39f8a99ee1431e83f87881bcdc0f587358a8bce3017865f5cb724586e0bac135
font_01_sfnt_off0000e33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB51 10788 bytes
SHA-256: d51673177676aeb33abaa9c0b263ff4e1554dac6203e1dac05f4ee11c3509ff1

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