Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf69a36b16d0be2…

MALICIOUS

PDF

140.1 KB Created: 2021-07-08 01:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d8c8fc6a542d4831c19c49cdd479f47e SHA-1: 60dc83a16baf4faabb818d334c5790bde53aa3c8 SHA-256: 7bf69a36b16d0be2a4c3d1defb91afb60796c9819d3088a3258eb0fadbce9c13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised websites, likely intended to redirect users to malicious content or phishing pages. The presence of numerous unknown URLs suggests a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/l7afej9av97ng144fngo06v2sq/55239356888.pdf In PDF document text
    • http://hotstamping.pl/files/file/53356641140.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/164id21aop4u3a16htibcgks7u/22627416398.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b30cf808b03---kilereketu.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/60e768f029f00734d25e05b83ec79703/gogigiz.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/gerebigeravuburibufepomuj.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a151c8055a---63384340732.pdfIn PDF document text
    • https://fallsplat.se/file/tubuzulet.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56404a0be2---basixavotemogobowenafukax.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/89594024181.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088496287ab1---gigesujudubape.pdfIn PDF document text
    • http://12shio5.com/contents//files/kinazopedenogelika.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/tekisumalomibanogivakimuj.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/lojaruxazuwapuderoxu.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/bimedizonorizemutifatune.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16092511ac0402---papusofebeza.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210507010228.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811c577c596---77210415309.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/22521821210.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/a77113b2ce09e00288e4c0d79b26b814/67947836642.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/tisuguf.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/02bb7cd6e7a341b21d851fcc6dd54ee6/93140062821.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/0e4f8fb89934e4f6b2be5954aa9e475e/60576615654.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/jimababi.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5eb34bd246---18758243256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sex+hd+imgesPDF 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_off0001cad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAD0 10240 bytes
SHA-256: c9d2e67225561cecc6dad1eb64875a42d4620b9a2632661e6860c6e2e8af2c05
font_01_sfnt_off0001e194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E194 16180 bytes
SHA-256: a697ce808c079322ce796846019a7acb1422cf035b6419927980ad853929e9e1
font_02_sfnt_off00020adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20ADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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