Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb5ff6226dd34f3…

MALICIOUS

PDF

87.7 KB Created: 2021-09-05 15:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a138b107a6c524e88c7407f4e6f07f8f SHA-1: 98d740f90ffa7d1b456a9c964b17d5ed8ccc2412 SHA-256: deb5ff6226dd34f3d11d10de62e57aad6770c6f51eba3902b00e3740aeb71246
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, and multiple heuristics identified the PDF as a link farm pointing to compromised WordPress upload storage. The document body is heavily obfuscated, but the presence of numerous URLs suggests an attempt to redirect users to external, potentially malicious, sites. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607de88fa522b---leboriwopogatobutumuxodek.pdf In PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f55ffab8cff---gixotiwibejanin.pdfIn PDF document text
    • http://wenxuezj.com/images/File/89285906229.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/51122844012.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/9d0486b1434e1f176bfbb9b8b208bcdb/80737316129.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/vovid.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/nedijinesorer.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a18f6dbed1---93330069471.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/97797653055.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160983615290ac---81630990017.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758752c77ed---96415766817.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160852f269128f---25846027507.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa53a0a3b3---zewukenovusedifavidawu.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/wagovaliluri.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/66296803160.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/puguv.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/bb7acb030e8a54ff7bf2c5d0c832b718/53920391417.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/jalakiwobuvigexi.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/7300251057.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b775cdc460dd63ff746d67144b44bb87/14747255143.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce3de8a0db---39194567030.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/4e19bbo3nvaeg1hlqb0k34h71i/fojekuwapej.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/32262078524.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/69625166814.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/36b59c04f24fdb555cfafc8dc196dbef/dudetuwegibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=le+commerce+ext%C3%A9rieur+marocain+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_off0000eaf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001030b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 10880 bytes
SHA-256: 108e1470f58a14ed0edc605e0d571b1c21d358b3bf40b16874561394f948796a
font_02_sfnt_off00011bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD7 20132 bytes
SHA-256: 8c758621e401b06b844f0c64429d01a84381f68702ca164db4e92d930c608007