Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd69918ebe2e754…

MALICIOUS

PDF

76.4 KB Created: 2021-09-05 04:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 85d7d61e183384cd3c5e4f9b7f06b123 SHA-1: 91abf9d5b38c19ebc82a0feaaf0c2e33016a284f SHA-256: 8bd69918ebe2e7549825e31e94f74b0110183a45329b979440dc66c6f0785c01
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to potentially compromised or malicious websites. The presence of multiple links on disposable hosting and compromised CMS upload storage further supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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://epoxidice.ro/mm/file/22935534754.pdf In PDF document text
    • http://guojingmall.com/userfiles/file///sezugijoxizusilofonosaza.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/pirejurepaluz.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966be4ec7fa---jevetuxupulumasudir.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd2327907a---dujinowilujawumogebi.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e59a59f7e7e0796d0b5c8d1215030aa8/67061721850.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/68433729365.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/jokamosarajorelijugaze.pdfIn PDF document text
    • http://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/77571336520.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612ced0694e86---71235627957.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/491ca7e2bbdd608d0e5e8d59a11d7c1f/nuzujede.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607889cfdb984---juwadaxuxufo.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/67266201244.pdfIn PDF document text
    • https://rajakedua.com/contents//files/10574102405.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/rurole.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/fizemewobodomu.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/d2d8caf1f72395f58bc4ba7a86bd60a9/nerebumupetur.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/72066290202.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/86364975653.pdfIn PDF document text
    • http://brukbet.com/user_images/file/87473186263.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/1815cea76e1c5caf48af5c8ed6a002f6/sixubonuxotarenavame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=secession+and+civil+war+worksheet+answersPDF 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_off0000c7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B2 10788 bytes
SHA-256: be648973cc0dc9774445220a12a5a2c5db595f8e9615a175f915699f2b2242ae
font_01_sfnt_off0000e080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 17092 bytes
SHA-256: 31b4430ab28f479490b26cf95ae8daca05961d442d6e5d8080a7eff8a9459b5a
font_02_sfnt_off00010c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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