Malicious PDF — malware analysis report

Static analysis result for SHA-256 07d55087394cb79e…

MALICIOUS

PDF

91.8 KB Created: 2021-09-10 14:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a4d462548080c93c07f5658b1ec60c5 SHA-1: 7145083ad075559b18029ea82b0553ebcd3d254d SHA-256: 07d55087394cb79e5b0d31e38f1bb052e9717a8067317074a66801c7cf3d3519
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://cructi.ru/uplcv?utm_term=the+world+according+to+humphrey+free+pdf PDF link annotation
    • http://pass38.com/images/contentimages/files/zanedemosefata.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/efc21b8bb16c2eae73b2365c650482be/vapenekejozalusitebem.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/23000989887.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/todefubomifobavepodefu.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/21365847858.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/zonadaxoxopekopire.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/5700626485.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/28855617193.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/kumid.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/vedobikilolujox.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ba93aed6fc346804c7b682eacb34d2e9/44813562241.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/45119720009.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/guxibibokozorakiw.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/lofosubusur.pdfIn PDF document text
    • http://uco-kampen.com/media/files/tagorejume.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/68562074346.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/xobis.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/rinizisitiwoviwawejel.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/50032454560.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378aef7723d---jojobovaxak.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/dojuzuzitegunadesivo.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/fe657eb6bf7cda423099317884f18173/10803304869.pdfIn PDF document text
    • http://armanetti.com/images/dudozonimakilegadufonawa.pdfIn 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://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_off00010328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 17468 bytes
SHA-256: 4d498d82a6b80646eac690169903d4b8e714b4cd48a4d3efc1498258091cf72d
font_01_sfnt_off00012f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147AF 11160 bytes
SHA-256: 3d923fc8874fa127bf54076fc2c2fddd49115bb7ce9312e908820b12cba53dcf

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