Malicious PDF — malware analysis report

Static analysis result for SHA-256 01a66a91b3245a20…

MALICIOUS

PDF

98.4 KB Created: 2021-08-13 13:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: c1de3c776c527704973e0f0d96d74822 SHA-1: 4cc1fd27921f179e4acff835c9abc18b5c967ac3 SHA-256: 01a66a91b3245a2096033bbff89687ee6c337edbf39822931cb46927f0335b96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bf5084adf904e0a0100e7147389f6b21/jalasemigekopuxubepisebaw.pdf In PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/40006784051.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099c247a58f1---lijatizavipewema.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090aabeabebb---35172177318.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9d33612b1---najipawiduvode.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12b39dc1d0---resenudujixibaribitonop.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/h7t3ucvtco2nc44dunpljeghe5/rokasesinojofufiputamuj.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/22914682600.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e03bbe04681aa3dbb32e9de4fb474e16/61294630670.pdfIn PDF document text
    • http://lucann.com/Upload/file/lupagafujelitadaja.pdfIn PDF document text
    • http://vce34.ru/attachments/file/3773781813.pdfIn PDF document text
    • https://ivaco.it/file/supibidigagazorisodasop.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/vipoteguxifaxal.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0564351e39dd388b8d67d68317b8f1e7/54412820384.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/66833778631.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/v41ik3834ff5l5a6misvi38tpt/88981933756.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4a385d357---puzusonoku.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/fokozupix.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bda3856bac---nerow.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/202186548433777.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/poxivolumagirib.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/jekosusaxasu.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/mitaxotujero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=3.+4+biogeochemical+cycles+packet+answersPDF 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_off00011c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1A 11472 bytes
SHA-256: d1528b3f93d23bf27bea9533f95794106bd260ba0a83897aad9c0a3f7b8edc1b
font_01_sfnt_off000136ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F01 17456 bytes
SHA-256: 8146328ed96670a2d2f5b25cdd09a477f9b049db837510319fd72b286ea898f9