Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6346e5af3a693c…

MALICIOUS

PDF

90.4 KB Created: 2021-06-26 01:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d679d9772b4a0f126ea110363ed6e869 SHA-1: b8c64b399a1f40ef2731605da5d1402ff29bb1c1 SHA-256: 7b6346e5af3a693cf19ec25242ea0d4461effe4bdcdbd07d6c48cab5ea118ca7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious content, aligning with the characteristics of a spearphishing attachment. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=roddy+ricch+40s+on+the+jeep PDF link annotation
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8476fafcb7---35871892.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/88682225273.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/punirukadokoguraja.pdfIn PDF document text
    • http://atek-ent.com/upload/file/mekajunabibavavopitobosud.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca29b34163---wolilezomakonoli.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/dokiw.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/larigevakanudukekiza.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/a62d7013cf476cb7c845cc0a9db2794d/67331350002.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/47611493169.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160af401a213ca---65376095872.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/77626851681.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/8bac992ce763e90971fbef992b4d9e51/kumek.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/89489c82577b9a2e5a00276fe12ee8ec/99782960971.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078468820fbf---bariwebe.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/segezezefigodoxotumu.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/sasazafitewaraseragezofe.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/79966868323.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/91389066513.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/9451ff988e794273482c1a7676fbd78d/72443196502.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/u9ek12krgtdhkthi8pr7ib3gl0/lapeximakagenu.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81b0967e5c---95214430294.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160876a22530b0---mivulewuzevubosorasivar.pdfIn PDF document text
    • http://mega.kz/media/upload/files/89384896058.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5b68e10e2---29644062946.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03B 10892 bytes
SHA-256: ae4dc98441a7d878a527204bbaa79e703a0b112ae8ddd68c43006c9269d795d0
font_01_sfnt_off0000f96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11179 1820 bytes
SHA-256: 4858f632b8e4d76919b0bb5ff80cadf737c1074404a293fd6b8c70ab9696f900
font_03_sfnt_off000119f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F4 17044 bytes
SHA-256: 1606c5fcf25d917debb03c2268f08cf0fe21c56e95b9df9535813bd3be875fe4
font_04_sfnt_off00014602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14602 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46

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