Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f942ec36393394…

MALICIOUS

PDF

91.9 KB Created: 2021-06-27 10:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5df99c1a3ec5a4ef5cd7f6f05cfc43f9 SHA-1: 37207be2f3997498a3bd4101e614d8c6aaa64e9f SHA-256: f9f942ec36393394dda04771fb341964972da783330098aa7de2b1c89645af95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to multiple compromised websites, many of which are hosted on disposable or compromised CMS upload storage. The presence of numerous links to potentially malicious PDF files suggests an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bjeclinic.com/ckfinder/userfiles/files/65755480617.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/1de311d83ffe61315fea0227dc32de92/refefikiweroxif.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/df805a2e501e522cd9a95a3badab54d6/7491841278.pdf
    • https://aimhc.com/userfiles/file/satupavu.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/869b657cb5c83981988d5111a977a5f8/nogotexazuk.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075c662850c2---92026548281.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/c3lr7cqla6cpqv9vrc2724v81s/39454061918.pdf
    • https://miguktour.com/FileData/ckfinder/files/20210625_360D9140E3F6E1F4.pdf
    • http://changrung.com/ckfinder/userfiles/files/tadutototofepogilusajivak.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080db6e62b2f---19661483049.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/693fd1ff941c600e20cdcddcc8ec3fd2/11997474839.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ce8a59767---sosonofoxewuf.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099fdba3ad19---45790160880.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed7ab40a68---42607346682.pdf
    • http://dailyliving.nl/ckfinder/userfiles/files/dexosofomosisobip.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8fe3d5a90---15895744770.pdf
    • https://leuphuotcamap.com/uploads/image/files/berel.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0377af257---20726088634.pdf
    • http://jtipartner.com/ckfinder/userfiles/files/15750800894.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/3b118a85f5a7e59e75b4a9b22d8d0ad0/jefovikiva.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/92912927bd1902e1bed12300e6949eda/80453097956.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe302c7bb1---18254177123.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f915166311604decd3ed2809529b8fca/tudifuxulerevewetu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=hope+she+is+recovering+well
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/acc251532cefda02c50e74bb34e0ef43/79654393759.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001049f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1049F 16792 bytes
font_01_sfnt_off00011cb6.bin
88f15720c1453b92a30be91e330632450e946f85b7e76e2aaf3a38e0947e63b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB6 10536 bytes
font_02_sfnt_off000134ad.bin
0305cefbffbe65f82fea9374aa68afb57811686622b578bc7a0cebacd5e8d6c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x134AD 17664 bytes