Malicious PDF — malware analysis report

Static analysis result for SHA-256 a116c58a668e4d3e…

MALICIOUS

PDF

84.2 KB Created: 2021-09-10 19:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4dc65acd016f9c5009313b4f7dcf6198 SHA-1: a35aa97365eb4a3588d36fd9308770a5f1e383de SHA-256: a116c58a668e4d3ec65aa22b81aed0bf7a85b50682233e937899f4bfd49b06cd
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable or compromised hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://girisimcilikproje.com/resimler/files/35091760576.pdf In PDF document text
    • https://fishboat.hr/files/94237599037.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16135ed6f58e84---84239606252.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210903110055.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/muzejuzosedek.pdfIn PDF document text
    • http://leeandrewdavison.com/download/16100557861.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/sivenewakov.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/28143269740.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/e51d6f6a8f65baca5055096622ba1a68/16458065122.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/bikoxotibowalurujuv.pdfIn PDF document text
    • https://el-tall.pl/pics/file/67765997784.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/lolabe.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/pujugusakozinimawe.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/livivoxuvix.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/62552098301.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/1fvjgd58pihvivd1ndiiuhbrn4/22134337878.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/fujoza.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b660c01dc14fcc8ca350397407010b3c/mutovowovepezi.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/raxaxifi.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/97775968919.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134817816bbe---pagopuriveduxigotaju.pdfIn PDF document text
    • http://apothepharma.com/upload/files/55110824136.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/winusugata.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/boputavavewamavowuxewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=angel+no+555+meaningPDF 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_off0000e6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A2 17940 bytes
SHA-256: 60f7e2bf005230f8430b656d3672cf2e17bd534ce0437aa35a6d85d8ecffb6e5
font_01_sfnt_off00011444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11444 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5B 10200 bytes
SHA-256: 8a98edc3f49f8c1d055ce33b93e6bcee0d57dd487cc502e7600d87b987da6a38