Malicious PDF — malware analysis report

Static analysis result for SHA-256 d05ab3119adbb9d5…

MALICIOUS

PDF

73.5 KB Created: 2021-09-19 11:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 42657dbfecbb51232b6340cef3bd9122 SHA-1: 478b4fad46266f2e5d50c16674f34030451da0cc SHA-256: d05ab3119adbb9d5d2e0c6ecc7a2a36d275e1806ad5819f33e9e012fc9d8d63e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains embedded JavaScript and functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://gold-carsales.com/js/upload/files/dumaniji.pdf In PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161417bc33de00---66780433506.pdfIn PDF document text
    • https://successalpha.team/upload/files/wununukalomojazasa.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210910120611.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/69180456183.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/mafog.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8e793520f7c5802c771b53e96ba2e85b/98140876748.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/b0c2f7dad988a4835d8da2e740c64cd9/gujobapubezatux.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/kazuvojirejukupuk.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/0be2c5d95805d28563bfa46a5fc7e15e/24583978257.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/70902112393.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090415273873499.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/29486320720.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/80357788987.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/fodaditazevuruzajijarolas.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/1e3c28a2a88d4acfd96c84fe86969449/31332709921.pdfIn PDF document text
    • http://wernitznigg.at/files/kosiweluzoruwazugifilu.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/665e9d6751340e4e2ff44eef63222be8/zegudosisa.pdfIn PDF document text
    • https://wsbtitan.com/images/file/rigufofu.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/85982508207.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/86512314477.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16146702ac5b9f---pefazuraz.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/69752476608.pdfIn PDF document text
    • http://skisun.it/userfiles/files/vusodujuxegorut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+room+comPDF 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_off0000c018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 16812 bytes
SHA-256: 38b07f647ac7c6069fb1cb75920b64f6d3a2703c8b392d964c3260a3df55c007
font_02_sfnt_off0001034b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 9908 bytes
SHA-256: ed33db8dae57ddc4573aba44e06a4d9abdbe73652a686b63d4be29f958a03d3d