Malicious PDF — malware analysis report

Static analysis result for SHA-256 264c2fb9b7df56d6…

MALICIOUS

PDF

102.6 KB Created: 2021-09-01 21:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 04d6592f4aa78982d8472c09e1e96e04 SHA-1: b2c55657c7fa00801eafca02a01c9c458a0ea42b SHA-256: 264c2fb9b7df56d6f37b1a1e9bed07bb0bc86ed41f83c6fbb0953608fa0fc667
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of numerous links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://theelementrama9.com/userfiles/files/28031643923.pdf In PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fbf5a3b8f16---desaso.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/05b93fc5e4207eb84e8b6fb0a38b845f/71517294017.pdfIn PDF document text
    • http://taigesw.com/upload/files/44935292934.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b109a945ec1---47907746049.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b0a2affaa64ee6aecc2ff09191babd74/benorugebimebaref.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/45641773407.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/6deb366573ffa8ec43cb012092c8891f/18322129240.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/webabavidekekilek.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/24512072744.pdfIn PDF document text
    • http://abpaluso.com/upload/file/49882746498.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ksgvasd7i6o834u0k6i8fr9uek/44402723835.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/mumixevox.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/cdda689977dead93aa9aec5c25559266/depenikorivoki.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/wulexexabida.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c163f9dfc2---neduxirizepe.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/6726476774.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/fuvoxuzumunev.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/75764493348.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wedozagilasodejuko.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/13373710959.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/livivebidagalosoj.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/63738207990.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fe5fb7d157c---tubiripetebafap.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/45168442742.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/60837f837b459cd2ae7fb90ef8683493/46816817089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+richest+in+the+world+2020PDF 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_off00012857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12857 19672 bytes
SHA-256: 25edc5cb464d2dc32d9993eaa6c0d60b038294f24020743e2909111115654a28
font_01_sfnt_off00015c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C31 10596 bytes
SHA-256: 58997e76e2ecc28143d7a4db99cdf0184963d86e4d8a4b5422d9fbe7c1590b85
font_02_sfnt_off00017472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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