Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7d695751ef8a46…

MALICIOUS

PDF

84.7 KB Created: 2021-08-23 15:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 194d15359fc0204813dffdc5547f7288 SHA-1: cd39d6161ae714aec2badb3fbbb0706fe7f6fc09 SHA-256: 5f7d695751ef8a46962dbc1162fc052831dc90b59faffc94bb9f75e14f8b916e
164 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It utilizes link farms hosted on compromised WordPress sites and disposable domains to redirect users to malicious PDF files. The presence of a 'download button' lure further supports the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cupanghitam.com/contents//files/mudiginasomosobat.pdf In PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/f649ru80hl3rf53dpnnj7dppds/gavixofirijawezawesaxawab.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/78168457758.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/gikelosu.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/52984466071.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/koruporefisasuj.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/38668910311.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d6af83c44---77459817412.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/femojubokiwi.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/38454513507.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-8-19/20210819161032481231.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/pitejamotizenomugis.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/xuxaxomani.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160892abbc545c---gavosutizali.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/tatoxakinobibotoxa.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/sukes.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f5f83750f1c7d93896ff6207da5f6a47/13069654872.pdfIn PDF document text
    • http://jinohair.com/upload/files/60796527887.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09de5c91cc---nudenabepeda.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b08e62540d0---nudedaranabesovu.pdfIn PDF document text
    • http://vizcsap.hu/files/file/64742072419.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729566b2882---98371618603.pdfIn PDF document text
    • http://polletnv.be/uploads/files/4527709819.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/573raarb2f83akoj6aruf09jf7/mutijilowuto.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/gojexapawegisas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+download+an+email+as+a+pdfPDF 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_off0000e693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 17336 bytes
SHA-256: 5397933744adf6bf95f48de116847700ddedf677f461952a6f901c79e51d4a99
font_02_sfnt_off00012c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C23 10636 bytes
SHA-256: e4475ad247fbd0ff862a01b67b5f3935406ea12e2971704a5a5ab47fbdc6f2f9