Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7e792d0299f7e8…

MALICIOUS

PDF

93.6 KB Created: 2021-08-21 00:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 85ba928c636698e51dd56a1f9f97d028 SHA-1: 15259eee520020a0880e7da7656ef14a926c553f SHA-256: 8f7e792d0299f7e86ec720e93b7cfdad72da848a3153dc2f278df45271e2d52b
196 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. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it serves as a distribution point for further malicious content. While no scripts were extracted, the embedded URLs are the primary indicators of compromise, likely leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/ea314f19c1da0ee25a140cdb6a0b0688/sakixaximojolitunofe.pdf In PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/zawedewunebapasunorinul.pdfIn PDF document text
    • https://mollis.rs//files/58768696877.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/21736139697.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a750619d1cb---40982831529.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a8c7398496464e0b8469b33f199db896/57387854810.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/19ae4e3ed0281d1d4d9e0d143c78aa89/869329172.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/10486695707.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/7015101001.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/83747452444.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/80498800691.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ed5d959f17be78aa6ea3446e0a9e6ac4/10445404061.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081bd4a811ce---28253569964.pdfIn PDF document text
    • http://vanhacollection.com/images/files/rijok.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611facca78b42---kalofuginere.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b6602b9a1---rekufebuvofepax.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c6f34a548154ce0365053b639ba512c4/60547940287.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ec0535cd2---sikazuda.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b3f89beb7---vedunukuzunutisenij.pdfIn PDF document text
    • https://siroyensao.com/upload/files/dodidaxadakaxalejavomag.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/vogubeforawop.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161030e0099742---47309767179.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/galokinubovuton.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/30211515745.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/gajejuneporusobazuzu.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/49632668547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=is+code+vein+dlc+worth+itPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0F 16988 bytes
SHA-256: b459a4e1efdca84818ef8c5df0f127c962802c04172c8a765661a0fa37794ff5
font_02_sfnt_off00014726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14726 10408 bytes
SHA-256: 46c7826ec1b5f3264d0300cd200254ebf67f20315873e52a0c62b3a482113e11
font_03_sfnt_off00015ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA1 2140 bytes
SHA-256: 4f4825520bec37b63f73efc1c60af13f462632b1f4c716300bf85e8ac3041a9d

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