Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bcd43c2dd313960…

MALICIOUS

PDF

77.7 KB Created: 2021-08-28 04:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a0c680a1fd71505fe3ae4f90bf06198b SHA-1: 6133d8af186b063c421c27fc90213db0101d733f SHA-256: 6bcd43c2dd313960f17120a4c8337d4f4b2d1b72d9baf55b5912d01e2ea44825
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, detecting it as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/dgjubrmjal66rtltnllfd1pe2i/91739003278.pdf In PDF document text
    • http://clingac.com/d/files/pasosado.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/sofpp5jhdtsiuqk1d6ujh6mt30/63324133551.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/56677335992.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824c2acd0fb---xiromanolojomaralu.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/16628073877.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a65c5931a94---kewetusalupiditozizonipoj.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160823ceb0b039---xodunipew.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd22ef5774a---62256993330.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/56274013686.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/2282239926.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/7h1p0iqlip5b87l7b7c0rl06qu/jazegeparatuzu.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/vivagapen.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/nitasazebepa.pdfIn PDF document text
    • https://rinducm1.com/contents//files/59821361376.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160702e17dedbf---mevomufozajoriwapobek.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/fegotuwimifosireresizito.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p692kk7q5meij5a6o0saqr62i4/28608838538.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/wexanuzotuwuvuvex.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/6063571127.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/revilifamibaweragerovu.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/56668687576.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/obu8552799uhbgpgcllguc7bjn/95521422852.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/74152936265.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/52802593029.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/6cutgaui6jvknpi9cugehed8i2/58171401195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=sons+of+anarchy+s1+e3PDF 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_off0000cab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D0 10608 bytes
SHA-256: b8bb8882f3cc095636ca7ace3d1929d937d531b4ff54e4c7c7d299e25645d46c
font_02_sfnt_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 17720 bytes
SHA-256: 7db08debbd8554d51dc36992291030f2d35deb97acf1ae0deca709a1bc5cf34d