Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a4ad42d513df49…

MALICIOUS

PDF

85.3 KB Created: 2021-09-20 19:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bacdc7c0e68f4c5afc7cba27b8d1f2ed SHA-1: ec23dd5b3f5c23dcb198d312a98a52f40c11d4a2 SHA-256: 80a4ad42d513df49c2c88b120839509142c2801be826b0b1158114a162394884
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack by presenting a deceptive set of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://garglob.ru/uplcv?utm_term=blogger+android+apps PDF link annotation
    • https://rotterdampools.com/contents/files/41752985249.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/redade.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/92872545794.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/34942808563.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/xifudibil.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/teravixomigejarovoluxubu.pdfIn PDF document text
    • http://citty.org/images/uploads/file/simamawaxuwedesive.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/nejujasozuzunotosuliv.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/8744866687.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/27204179465.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132a14318b09---36133890375.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/70633676750.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/fometapiz.pdfIn PDF document text
    • http://hmed.vn/upload/files/makub.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614461fa382e7---42283653073.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/au7jhebgrqmuscd35klkdo6mf5/48813421494.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/muwifobepeba.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/rajozi.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/xuberuvenaxat.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/jovenopokuputexojudirug.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/gonog.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/76958070016.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/4242897312.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/verotu.pdfIn PDF document text
    • http://master-br.ru/img/file/74067542489.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/worafemikukagejafat.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/zamavudawuzomefusi.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/41449225912.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_off0000eb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0D 17268 bytes
SHA-256: adee2156e2f11294441be59fccede437d422eeb9df92dfaf0e2829c5c43cd449
font_01_sfnt_off000117e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF8 10524 bytes
SHA-256: ca60423b12531ca198da7447fd02a975e56726c7c886479d31524e6adcb03409

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