Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc050bbbd4cb52f3…

MALICIOUS

PDF

103.3 KB Created: 2021-08-05 12:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c9e321d18eb0270d409bb48477d5665 SHA-1: 7a7f0603068d5f83fa9f33860397eabb517058bb SHA-256: fc050bbbd4cb52f3eeaa4a2d4c13e63005159b7dde9603b770a472ad67c8d27a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://dmhu.eu/uploads/uplib/file/fuzumokifazozukimuvudet.pdf In PDF document text
    • https://kibledergisi.net/resimler/files/pisaxo.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4dc8a13f3---vunamopigatopamusonabunop.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/osh5cmans6ct3rsje0akbd8hdm/61443909972.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/84619259470.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/6458934974.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/72922301411.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/52552303223.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8cc2d3b60---simoluwuriwomunajeme.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/pukonasasotivaborinadu.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090fb9f4d457---87241970000.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/jujitupizomolevumefu.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/80f43bd2efaca124a487f23c8c2e3c9b/wenaruwogazofafolebopeb.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccfaa137f3---39681691712.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/81640993578.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086359b13e50---fivovitufudasus.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/2581152889.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a56107d86cf82127b32fc8ed66108e64/buzojejademenazaji.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/defexuwodoresemokewotodes.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/34176616223.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/44468634123.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/fedizeradal.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/264c0cc639b2f0af387a8bacace8b823/lesimorawutoreki.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/81137405949.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/7728028498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=a+cuantos+paises+se+puede+viajar+con+pasaporte+salvadore%C3%B1oPDF 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_off000127a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBD 10988 bytes
SHA-256: f3c055633dab72a2124cf212462431a532ba21cc56f630536ee0fb83cc5ebdb7
font_02_sfnt_off0001592c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1592C 19376 bytes
SHA-256: a4acb25ee933f562f66ed009b03aec68bee9871e457d0e9279977fe1fcab80a8