Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d6377747c5cf9d…

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 11:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40c93017fa482248a689f2f293f9fe1d SHA-1: 550a3eddeb119cd5eb7d72755492318a8c627231 SHA-256: 98d6377747c5cf9d69059c3442fbca8142f910a412d859fbe846e58b1018f03b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://hindel-relax.ch/ckfinder/userfiles/files/bozakuzekomolesokivigo.pdf In PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/k51s4h2on5hbhagg6kk0nktm3r/gotulujevuxosibakadowexiz.pdfIn PDF document text
    • http://ranfeng.com/userfiles/file/2021-9///20219161233541373.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/kegte49oelhalke3iektttp36i/sawiteweredefujarexude.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/96992886087.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/sojafisovedevu.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210916115540.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/dexodizife.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/97149590571.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c297e70e47---75572434927.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/8987584293.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109150605499828.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109131620355147.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/60563372526.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/54420307048.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/70912934822.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/lkod56q4h16m48k34jg97fuuq1/76914575874.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/49165706487.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/refaliwotujuzufi.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/57973060965.pdfIn PDF document text
    • http://budropol.de/Upload/file/bepaxisalur.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/vogajewu.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/20356682195.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/99614378478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mock+location+settingPDF 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_off0000d0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DB 18424 bytes
SHA-256: 19822cdda358c713258836791c20907376257683442b86f81674a14bc1ce7c2d
font_01_sfnt_off00010088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 10392 bytes
SHA-256: fe60aaed0d72e73f6d303834d2096b3e649817870ec8deb261463619406c717d
font_02_sfnt_off00011833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1