Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c90b07bc75a7f7…

MALICIOUS

PDF

83.4 KB Created: 2021-09-03 10:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3705238c965b32e3492c73c26b6ff420 SHA-1: baa52d01926d7330c8997e3bb465fe0a06763c1d SHA-256: 06c90b07bc75a7f79278080356ee92b799062d2c463bc5097761121079a41c0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://immodraft.nrw/images/architekten_agentur_images_/file/nubefapulakesonezilasuf.pdf In PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fadbc157b---53327606019.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/75959793994.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/cris7s9025p3kar56m4lcsegq1/potatixuxififak.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6dbc7c6ab---jexexonedozeziwimof.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/99630253032.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc2d0b30d9---jetoforibotinotowiz.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/lemivojasamipelorufudalep.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b6eec341---bonidakadapotiju.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d85317811---votizanifoxasilagotevage.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/debutab.pdfIn PDF document text
    • http://regmac.net/userfiles/files/75862504078.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16075022ab7325---67466373775.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878faf1de4c---8791336702.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/17378359155.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfc77e58d6---62256653521.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/36626745078.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/e4f3aq3dkguj19h65oskrrur73/bidevarinik.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/53313230962.pdfIn PDF document text
    • https://kimansion.com/uploads/file/31037250030.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4528a2402e---siwek.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/98834640627.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/80366045711.pdfIn PDF document text
    • https://subded.org/userfiles/file/ladimolo.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/nubibafuvapuzup.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed0cc0fe29---86922105999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=que+es+ecuacion+quimica+pdfPDF 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_off0000d707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD707 21660 bytes
SHA-256: 1eaa4b25ff1649e9b7d8eb63836e67fd7ad1b6b08c4562b064f951c3f7dc4c0d
font_01_sfnt_off00010e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9F 10844 bytes
SHA-256: 8ab615bcdd2f07e84f16aab76274996b6cf166c238b8886372f69ae81f299ec6
font_02_sfnt_off00012782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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