Malicious PDF — malware analysis report

Static analysis result for SHA-256 1639c1f7ed35b8fe…

MALICIOUS

PDF

84.2 KB Created: 2021-09-10 23:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 87a5048ae4f67abfebef7630a663a134 SHA-1: c34e8ea508442fbfd162d0364f763f181df28534 SHA-256: 1639c1f7ed35b8fe8e54b69d58a98199afa4a37a751072686c289583a48a071e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://portalinmobiliario24.com/uploades/fckeditorfile/biwakokani.pdf In PDF document text
    • http://sity-luxe.ru/userfiles/file/58807430785.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/vaxur.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/26909718930.pdfIn PDF document text
    • https://venus-forever.com/image/files/kapimeli.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/rimaxajoxuxezavajilap.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613954a475d9c---jowixagadonajome.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/87d687814d8aa357d6be2fde7bf26ae1/sozovumigowunafenemu.pdfIn PDF document text
    • https://soechi.id/userfiles/file/1146117768.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/93065063931.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/mufapofazedujowomuj.pdfIn PDF document text
    • https://zagi.hr/files/nidugovumobadu.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/kogobetozena.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eded825f18---98393613394.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/resafexise.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1612fba1d9d877---mopebixa.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/gutanewujopupikiki.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/82309315222.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/rireninagefolub.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/50688682066.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131c569c091c---jumetanibo.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/taluxizibekag.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/kokanapuzat.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/79759801882.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161378d9136ef3---96596601171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=apex+manager+apkPDF 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_off0000dfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEC 10248 bytes
SHA-256: dec65d1b48ddf501f851c32207d0e73f36a0c0f697f7ccb32b039304c85f1884
font_01_sfnt_off0000f6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F00 20208 bytes
SHA-256: db92cd1dfe6de817f5b162fd6349c1a8d36d295586f76e436e87aa8712185515

Open this report in the interactive analyzer, or submit your own file for analysis.