Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ffaac2ded4773c…

MALICIOUS

PDF

73.5 KB Created: 2021-09-14 03:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 36b8ae2d4aca07f5430dcfb3511ee3a7 SHA-1: 047f9870443cef19ae92cd0908a45a8267ebd03c SHA-256: 73ffaac2ded4773cf988689a35634abdf30f9d4c3cd3f702f14646e6488e0ffb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of multiple links, including those hosted on compromised CMS uploads and disposable domains, indicates a link farm designed to obscure the ultimate destination and potentially distribute malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://taociren.com/upload/file/210912012520070376wu4gle76f4wr.pdf In PDF document text
    • https://vzglavniki.net/data/file/31876262186.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/9535730210.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/77988075532.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/98334478263.pdfIn PDF document text
    • https://digicpictures.com/downloads/14408799454.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/29623595937.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/vabitodexerazenemufefub.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/mikusarutedekew.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/kapozu.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/zixibu.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/427e0d63a8c7a563a78a3508591b863c/12005615717.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/zutafobedimamene.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/tazaralenanabiw.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/59946740684.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/sovetimamaguxav.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/17497448516.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/77617901376.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/kimevoguwiwosajepikato.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/665114fd26a25ed63404dc5144b03ff4/14215050854.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/88329779876.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e2a023f9ce5745bc6a6561b09eab0074/71035831392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=index+of+series+gothamPDF 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
font_00_sfnt_off0000b1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FD 10808 bytes
SHA-256: c0ecbd11e774915f644848daafacf713ef0c1c672e7e161770257e50b9a8dc77
font_02_sfnt_off0000e286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE286 18344 bytes
SHA-256: 5993290a5c9a1f634217fb0a36e307d5e86047641d673551432d2619d027fb8c
font_03_sfnt_off00010fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDD 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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