Malicious PDF — malware analysis report

Static analysis result for SHA-256 78325d466bccfe55…

MALICIOUS

PDF

90.6 KB Created: 2021-06-26 02:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 31faf194152f49406dff1a399474fb53 SHA-1: 10acbf471b92ee289082c2ce1b4488721d92ba7f SHA-256: 78325d466bccfe558f996be46bbbd0f9b63235fc1e7c5245991d2646defe0581
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress uploads and disposable hosting sites. This suggests the primary goal is to redirect users to potentially harmful external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/6de994bdskc43pdmj5048ge3u6/52707035158.pdf In PDF document text
    • http://dambi.pl/userfiles/file/98556124659.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/nelateterekofu.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/420feb1dcb73a2956affe72a6a90b4fd/45511962491.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/bb3522a7639341dfdbe4cccecadb9767/rirasofoleg.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef1497d86---mepukexamitimekox.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/99455238246.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3ece893fc---ziwirumetinigugapel.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a423ea946a1---67884170630.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/14486016765.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/38428325899.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/i9i2pot1bv2dh37r5kk0v0vjk9/bidazofowe.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160878d2a285be---1682778572.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b18fd9a71bb---19582836020.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/bosujevovinexeda.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/bddaeb3be797366bb1b30e0afa7f2946/38464913202.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160716f46550fb---miraderobit.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c53d5d8f31120c665a748afbe3615570/jixoxegubodifutobul.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/wolexividawa.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/jutozumikazomipuzumevagoz.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d216ae6be9---65976165974.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/fugikimutipapunano.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/768a78a23a214e04af1ad2309fb6d231/wurenovugu.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/f32325b1ca05284e86fde8d578ad1db4/63705882354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mixing+hypertrophy+and+strength+trainingPDF 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_off0000fe28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE28 10832 bytes
SHA-256: 3ded9eecf1861f09f6dfd52e5e3c9e74b1ddd90fb48d3bc9cae0b706d744a265
font_01_sfnt_off000116ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EA 17540 bytes
SHA-256: c74a4009c2a501644efc4f9f585c7c61c47e3e151cb1d5ea7c56c82ef1cd65be
font_02_sfnt_off000144e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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