Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aefb51436abb921…

MALICIOUS

PDF

125.7 KB Created: 2021-06-03 22:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f18899d76270d82a1017c9cc47b57e4e SHA-1: 7eba8ad0d3778a3fa746ccdcf1fc62a84f6a8de5 SHA-256: 5aefb51436abb9215dc063993348e64456e0eb1165e41af6c6f82947441c2a06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9993

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://drafthe.ru/uplcv?utm_term=1990+mazda+rx7+ls+swap+kit PDF link annotation
    • http://fogathajtohirek.hu/fckfiles/file/78608497974.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb30f06f36---28376220093.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/99346362717.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/4d0849fea13bdb6ada3a7f2eb4330c39/99562611341.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c21e4b2ff6---magosujomumuribobuwudutap.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/1e769db7e421d244493c754c052d102d/8523431795.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d047657b58---zodufopazagakon.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/40a8f87604902419b0b4399b9a6a2573/menikomanijasifagewabeg.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/tq5350buigp583n0vdm9a2qnj1/80836646057.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a974ec62f05---sakibozawulu.pdfIn PDF document text
    • https://loctra.net/userfiles/file/30802210838.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b45aa2cb07---kuwet.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/6lc46i2kflgpto7sdt1aqeir6v/vetobubokagub.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/nokoputovudosanezu.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/2a6ab11463ff6b5cce5ae067bf316406/xalerebadejosipu.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/kuvedegefilulevo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off00017b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B9E 8492 bytes
SHA-256: 26279f86762cceb9cddf213ca0eb92a5767cce0670da293387d432e5f515bd81
font_01_sfnt_off000197df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197DF 5716 bytes
SHA-256: 837505e67d48808adc57ad91b193030399b4ea0bacb5f26ed5887eb0a553bb3e
font_02_sfnt_off0001ab64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB64 12088 bytes
SHA-256: 99eaad851cb4b8867db651605a2bfbf57f984cf7099ccc54134a08f130ef48f4
font_03_sfnt_off0001d3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3D8 16060 bytes
SHA-256: ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833

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