Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbfce3fe22549b8e…

MALICIOUS

PDF

69.4 KB Created: 2021-09-24 22:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d9be2c2a1352e7560b053e6d2e00b977 SHA-1: 0d97f9be580495eeed51c45a6df0bb05e1d6c7b1 SHA-256: dbfce3fe22549b8ecf3a31818bbcd7416abafbd3048cd45122cd23d3d0097a95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains external URIs and links to compromised CMS uploads and disposable hosting, suggesting it's used to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself is leveraged to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://gymostrov.org/gymostrov/userfiles/file/gapugigipigaxotonijetaru.pdf In PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/baxelajuwer.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/petivibepuluzarox.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/95121032316.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161498eb8cc9ab---mitokijenudofu.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/zunetamam.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/wavadede.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ee1e0bd61---78291181968.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/67877960823.pdfIn PDF document text
    • http://canoeing.by/pics/files/43153195498.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614983e4dd149---89560728150.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/22527939919.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/kebimomaxofuwejazos.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630756316.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/gijulajilajilip.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/103249794.pdfIn PDF document text
    • http://luatminhnghia.com/img/files/xibusipukorasofuv.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/40405924694.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/60471112402.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/girokogudese.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210906015028.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/47361010899.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/86580489405.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614146a71cf2e---84258796314.pdfIn PDF document text
    • https://33mobility.net/uploads/files/43708719445.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/28723028916.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/xafovesavezafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=visual+auditory+and+kinestheticPDF 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_off0000b2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AC 10744 bytes
SHA-256: 9e743b349064f3a88f3283a4998f525e3a0bda661278193e7c58362be492bfa5
font_01_sfnt_off0000cb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 14516 bytes
SHA-256: 58ba2733ae2d5d340f2e981b655a23fe1a7716e9e5bf14341193fc435feb89b6

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