Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ab239c78dbe0dc…

MALICIOUS

PDF

79.7 KB Created: 2021-09-23 23:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0de95a558d1e3645d0804e658df15342 SHA-1: 0a95ed64d3352569d035753074f38f28740e156d SHA-256: 58ab239c78dbe0dce68b434dd27c34226705c903ca11e9815c2e3b5257b61ec9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f014deee---79843616868.pdf In PDF document text
    • http://lifecare4all.com/upload/files/digekevitobivipu.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/giwifojitazorovuzepejule.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/49407864658.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/geputeduz.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/28590457934.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/wagumarasuza.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/lamavogasal.pdfIn PDF document text
    • http://skupka54.ru/upload/m/jufuxokobodesoxaga.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161363ae1aa12b---vozij.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/69753787891.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/33049963985.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/savakukopo.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/zuxakadobalodamokeru.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137bbbba9694---85462651099.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/tuwewunesipotodufaxo.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/mimujelezukuwanab.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/fawit.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/seluxaruf.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/bodetapalodupelopirizon.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/gujiriveluxuxerata.pdfIn PDF document text
    • http://salt17.com/userfiles/files/26740125483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+clear+cache+in+note+8PDF 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_off0000d578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8F 10444 bytes
SHA-256: ea2c4771343a9026b6857fb2c6a351a0e8c169c357901bc7c4ce1c59960f09dd
font_02_sfnt_off0001052f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052F 16976 bytes
SHA-256: 7dbf762886d3134125ed96faefe43816ca813df33219a585ddb5dd75b8334ef7