Malicious PDF — malware analysis report

Static analysis result for SHA-256 73902c54bd4e6425…

MALICIOUS

PDF

77.8 KB Created: 2021-09-06 18:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7fc1565ccd8177d3888a27039d569e2c SHA-1: 8d916e93cdc17c281d5d2db0ff7a221bf0c5ef75 SHA-256: 73902c54bd4e64255f16bbddd21fece3f1f8ddef6c0773fbab915bce4664500a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to lure victims to malicious content. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM firing further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

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://crewmak.ru/uplcv?utm_term=listen+here+intermediate+listening+activities+pdf PDF link annotation
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/64ae0939e068aa2de8ac5aeb12aa278f/9590970216.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/mujiw.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160dde1764210c---34511201185.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/mupazalabagiz.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/60e63c040065551ad1c49cd2b4199e12/dibufomojitakit.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107180103425343.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d82399d4d49---7344777075.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be621c1cdae---71909995459.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/diduxajaboxopivevexetim.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16106bd3e3303e---16932226472.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/59311427249.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/wixuw.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/56854521927.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/6ad81fe4c758da033958a2491b17d516/vejelubapopomimaki.pdfIn PDF document text
    • https://x-software.cz/data/file/newawegapepijamum.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16072ad6a66cb3---tujufa.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/30555437211.pdfIn PDF document text
    • http://konberdbio.com/upload/files/nefiruz.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612703eca68b3---dutukatavobadetageporefo.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e44b46098---zagokuzatunikukefanizelup.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/1af3285962a99d3b85cd0e4e48d69e56/59583128244.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/kafutuxiwakizazebapido.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/31027431367.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce824d8213f---48605101057.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/jinilazon.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/gibodijejisap.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04F 10968 bytes
SHA-256: e3ab63ada949fd3bfbbc0443acd6bf3d67fe3562f35944b42d32fe5c8c9cfeea
font_02_sfnt_off0000e95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95A 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_03_sfnt_off0001002f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 16216 bytes
SHA-256: 5af2a391f2f80082abcc09d78088a2eaa6f74272591eb8f2698d79c788f43381

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