Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e7d25c0ff9bb7c…

MALICIOUS

PDF

85.8 KB Created: 2021-06-30 13:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6669c20d51e84855287870bcd1db62b3 SHA-1: b50b0af2e3af2bf71d58f73b8ce3518d0b3801cf SHA-256: 54e7d25c0ff9bb7c59fe23cb84b20c290ebefa06f52c4e72bf1731d2f7ba6c01
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites and disposable hosting, likely to obscure the true destination or host malicious content. The presence of a 'download button' lure further supports a phishing or scamming objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://lapalettedesarts.fr/gestion/file/89210001551.pdf In PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/9b228f8203af1286ee2876500ac77d4d/muxonabo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071624b31802---sezozipiwax.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/wevikiwamepoduni.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/joxirelewuger.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afeaa0320d9---saxitefoxukosolibofox.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608487309ada1---dinaripuvugemidi.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a91a70bd9b9---35540369295.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16099f5c03dcdb---43983089171.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/selovo.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/vejitefofuxijupekogubufo.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/0cca956a913739329b32f35161064a97/gowenozi.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a543af53e8c---kolebisanononogokopaxi.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8673bedf78d0c2ffa5c821a0248c9149/35889020730.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8dcd366f0---wuxanorute.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/kefadixonafakevov.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824bf48d470---niwosadomesibesuwap.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/1iu5m7bt4mojtb9gmd8g60dso4/35236573024.pdfIn PDF document text
    • http://yuhongzg.com/d/files/tozuvuridevifixeva.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aab39da5b61---15870547295.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffac4c6b9e---99885425390.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/194708804160db1c3b2aa81.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/vajirovuxokuzug.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/94073792569.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa11de41f9---9499516504.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608922e56186a---kakox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=minecraft+pe+helicopter+modPDF 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_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 17472 bytes
SHA-256: 83d48173afcdae9057c7fe04ec1c170febb44ad857eeddaf2dd1f687b5606b6e
font_01_sfnt_off00011936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11936 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001314d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314D 10708 bytes
SHA-256: fe26e6a532e866a1dea70da232e65ff1078e99157e0dd3baf59b5a066a71851d

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