Malicious PDF — malware analysis report

Static analysis result for SHA-256 f170802a71e368c7…

MALICIOUS

PDF

72.1 KB Created: 2021-09-19 15:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d32609d97a65f8512b1d17111c731884 SHA-1: 74b96bcd6ca39380a915376b9e72cf79eb0fe0ca SHA-256: f170802a71e368c77c32a36f9f8a4d973e7a27a8c1a2edfddfe0aae64909566d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, with the explicit goal of directing users to download a VPN application. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/17889264753.pdf In PDF document text
    • http://streetnn.ru/data/upload/ck/files/mazigajipizifigapuwuso.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/jutosikos.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/41451394936.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/49989204897.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/42475537616.pdfIn PDF document text
    • http://plise.org/userfiles/file/42561710977.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/nuvigotufixowu.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/pabasiserifin.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/60d765a975caf8888220edb6d071db3f/78976580117.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/dakev.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/72961717708.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/lejegokazoloko.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e99b32ae80---1408172370.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cae830c842---pudadowatise.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/duzirapukopekaw.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/11577365187.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/saxasofarago.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/14513443558.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/89189192067.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/nasuvexemijidabikujur.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091121531591.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/16568361806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=vpn+download+app+for+androidPDF 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_off0000b9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C3 10148 bytes
SHA-256: ee86933d5d1924dcda5e225b8aaa44a2e397843a0da75e32e631de9057a6cc42
font_02_sfnt_off0000e881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 16576 bytes
SHA-256: 6a33d0827135d129f5f3232155987cd8e87d1d10bf7fe586a3c3c6031671e1d2

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