Malicious PDF — malware analysis report

Static analysis result for SHA-256 92452c30a6969486…

MALICIOUS

PDF

70.5 KB Created: 2021-09-30 22:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1f750024c9f22ce8528eb3ca55f7ec80 SHA-1: 61483e79659a6be37b2d99ecfc5f9381856304ed SHA-256: 92452c30a69694868d94df1e41d8b128efbfad71fe7146f3a08b3339574ae951
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, indicative of a link farm. The presence of embedded JavaScript and a high ML classifier score further suggest malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a phishing or trojan distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=rovercraft+hack+mod+apk+download PDF link annotation
    • http://win-sonic.com/ck_imgs/files/38263666081.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/bejokagopaze.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/padowosifosopesasadidete.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/bugenelifejopuluto.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431a188ea7f---61115590076.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/watawugolugifupesibi.pdfIn PDF document text
    • https://ckmandarin.com/uploads/90798889570.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/69088926573.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/41250271816.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/86068525906.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/vuxiwigeferebegimitog.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/14818247040.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161495772088e2---94031688784.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/kuloxejujepewavokok.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/23314796234.pdfIn PDF document text
    • http://penzion.sarmo.cz/Images/file/29343227617.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/14407129376.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161410e3caeced---ximeginamogokatixulota.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/sujudakagezipitewadurux.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/36724568830.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/xebumilozemowunesipoku.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/rapowunavusadaduj.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410c567155a---gewitunawesibi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB089 16796 bytes
SHA-256: a8bab5dafeb5621ab5bd986cfc4fd06113a779321b9a5f72840de31244be9b99
font_01_sfnt_off0000db76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 10912 bytes
SHA-256: 1d595801dd8bfadd496a14bf8759eccc849a0098901f9342e745fc3f84dc50fd