Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10682f1c65e2f52…

MALICIOUS

PDF

93.2 KB Created: 2021-07-08 01:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9040afaacc6737bf8196286a92b28a43 SHA-1: a7c99f8252d4a32317d4ce15ee03a8ea6b00100c SHA-256: f10682f1c65e2f525b44fce3524e9a1bcb9b8ec156710aac863c41be852f627b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning tactic. The presence of embedded URLs and the nature of the heuristics suggest it may be used to distribute further malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0tudionaemg5urui8lm1lbdja/jofogufabukamutebol.pdf In PDF document text
    • http://netinflux.net/userfiles/file/17107922002.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609846fa95224---gepovubosigo.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c1ce4faafd330707ef2cd579aec39de8/ruxuverijug.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/53071921242.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607333ce358a2---devuwokebazewavediva.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/86093bf12b4bcc862d6465d3143d3dfd/xizuxojavubejam.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/43096750796.pdfIn PDF document text
    • http://huiking.cn/uploads/file/162350201147.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1au9vnd3p2ihh8ndqhjieh7hjb/jebaruw.pdfIn PDF document text
    • http://stroi-sistema.ru/img/58264411728.pdfIn PDF document text
    • http://renknh.com/ckupload/files/75183951708.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/51610607853.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c3d421ff2fcbf03a186327c412b116cf/31243535667.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/wuxadopufokalibu.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/68702879304.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/tj9l06usq01o7jq1u6q5orujqv/57345754107.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/65875283940.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a32af85c58a---zimog.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/30bfa46dcdff891c20d33aec5d9e30bd/poranozawaxuxoxitim.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/gilunu.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/gevplklvh47fot1ghi59g816t1/59860592190.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d00a5d8f52c8461de19e2b12b4a25026/82764404505.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1102155e6---55000073600.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/gekadapikuzupabunejemoso.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430145612410720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=non+denominational+school+meaningPDF 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_off00010933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10933 10696 bytes
SHA-256: 84a62b5a909e05223d80977fdb7164d8713e137f30def65fb7c21ea6794d6d8f
font_01_sfnt_off00012152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12152 17576 bytes
SHA-256: 207e5b27f642576987343578e156ff7019a698618584ea23d9e634e89ea42cd2
font_02_sfnt_off00014f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1