Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1079516986d1b80…

MALICIOUS

PDF

76.8 KB Created: 2021-09-14 06:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 133acea9fec7d60266506f775c62ea2c SHA-1: b2695fbf7db0d0bef54db18053e84ed12d6418c4 SHA-256: b1079516986d1b800069c2eba23f4cdaf91f8441b23ab1779780c9fb2c19e9d3
164 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malware. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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 https://tenshinorchids.com/FCKeditor_upload/file/91733395823.pdf In PDF document text
    • http://www.farmaciabergua.com/userfiles/files/vodejenipalemexurinubo.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/26107914326.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/zigulekubukesu.pdfIn PDF document text
    • http://artediapharma.com/upload/files/togad.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/vanubaterako.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/57082148971.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/59959488937.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ud4t6stq7fs3mu9lpfsptplhn1/pititevotubipew.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/potev.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/70186249702.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/82056161903.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/bibakijewen.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/d35751e78942381f8b30eabe190896a5/baxaxededanoxarikotadarim.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/20803679670.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/33393210139.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/jeroremu.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/35541552412.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c666a9eff7---wememalatisoj.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/69139526025.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/91692667973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+download+ldplayerPDF 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_off0000c740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC740 10316 bytes
SHA-256: ca48ef24020488a407e5eefa6cea32a5cd3aaab0399a15fe4ebbfef30902c29d
font_01_sfnt_off0000dea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B9 18088 bytes
SHA-256: 4e8348a8e1d8aa848d6db7cac50210d798137caf4cec79553c471bfb3954ac81

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