Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd10c6aa0fa8c10…

MALICIOUS

PDF

123.4 KB Created: 2021-08-04 22:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b45d50c9e70d61a699be50c158f8048 SHA-1: 73270648459913d8dc5f0aa36ed34e769f95bec5 SHA-256: ffd10c6aa0fa8c105da4eedd9d1ef9eff71ca25fd262083a19d62acfd6dd51a2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and other domains hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content. The presence of numerous external URIs and link farms suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aashianarealty.com/file/govudotetirara.pdf In PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609574079bea2---motazejosuzi.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/rf46nh1a2u3i05gvfnsc9867mo/68961097751.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4f6b025f1---kigatigozixasupik.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210625002753245.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/79859525512.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/lipirenawilosi.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/emc7mfq878005rfv47qg2l8pcm/kexuduxi.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/jenilubaro.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/51720001957.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/52133441784.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/80707164039.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/ruxebememutafawomo.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/89l6hi6o379gj2iu66q47vs6i7/77980276349.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/12312899462.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/lj63uj8gikv66tff2gl2pq3rcs/jubaveborifetuxema.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/85510191951.pdfIn PDF document text
    • http://skomi.ru/img/files/file/8676418711.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b13e6752e---gatonunuvomasubazez.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947d9645ca5---60235907722.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5328bee2e---52622762796.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210726114642_hdjidz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ratib+al+athos+pdf+latinPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00014b6b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14B6B 31348 bytes
SHA-256: 5df27acb26ebcfe1bd2509aaf197700d1f7b7c213e2f9668f7b2c08fa6147759
font_01_sfnt_off0001836b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1836B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B7D 17836 bytes
SHA-256: 167a7da6752b121fc942b878043cd9cc5b6ccfcad45ad6366d64949d43ee12c3
font_03_sfnt_off0001c81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C81E 10548 bytes
SHA-256: ba7df907da1a139479e26b0287f95f2261b56f592b180232e49a5fd0545b1d63

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