Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1216fc12cc8148…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 10:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c43b853be370b3a8690775298464979f SHA-1: b316542d73fccff28f487f9e46f0ebaa41f62e94 SHA-256: 9d1216fc12cc8148d7e37b86ca1bf7cc330150772c20793d876d3280eb8927d3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm and potentially malicious content, with ClamAV detecting it as a phishing trojan. The embedded URLs point to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to distribute malicious content or phish for information. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allmassage.net/upload/file/20210915163353.pdf In PDF document text
    • https://indiansabroad.uk/userfiles/file/24113170846.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/16612123368.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/471076246.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/p03drjiaa4pnci6ihdef1pn6su/jutinadep.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/48040239145.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/wimofovukomebudepudo.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/68099644780.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/48610815089.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/38979241473.pdfIn PDF document text
    • http://sun-tes.ru/files/file/76612530260.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/mosilodifujorabenuvas.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/lopixesukawekipumuvezizi.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/figugapotilulesepafiwapa.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210906011235.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe11aa2e47---webunorigak.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/9d698251b86de2360855d6a633b1d9fb/71645059388.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/fofivif.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/kavuna.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/lawekaxugonosenanuratexi.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/depalamarulig.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/ruxotuv.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/83518512764.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/43850692126.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/94460832714.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/fukusipagaporaxumuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mx+takatak+downloader+without+watermarkPDF 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_off0000d974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD974 18208 bytes
SHA-256: bc971953ced957f991993f05dc0c47a9816f789b2991cffab8c3a080f1cbb4e8
font_01_sfnt_off00010907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10907 10720 bytes
SHA-256: da7277e542dcb9f953f6c9c15c434c0feb7019feea71df980134a1b49b58e796
font_02_sfnt_off00012174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1