Malicious PDF — malware analysis report

Static analysis result for SHA-256 532b589bba9b35e4…

MALICIOUS

PDF

76.0 KB Created: 2021-07-02 18:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bec04bee56cf6f99148fe605badef310 SHA-1: 092647d63a4b038980c4c6df51cf7bf21ef0a66c SHA-256: 532b589bba9b35e4454c1d168fb22de3d1578f4ac58e99db20731eba36524c0a
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URIs pointing to compromised WordPress sites and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL analysis suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b70b7a374bbf3884919a4f5acb9aa620/tefufegodiwafovowosuwi.pdf In PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/58953600808.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1083c014e2---68901851407.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be50d606544---kavolewitosone.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/funabafijozozow.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb0840070e---gebofipi.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/66169658934.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a026b7ca81f---muwunupixoz.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/popafijazumiwarogewa.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/47506209817.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a595fd29a09---35863511165.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e48b947b6---rasejaraletinen.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0339628cdd---98241046211.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/fbfa1b89d7594f53c91ed3246d5e42ce/jitoke.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/gaparolorekamelimo.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/22586458248.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/v015savkebkdn0o4uf6jba428k/33006779262.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b478ace12ca---37640382959.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e27e2602---33698921442.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210610204943.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/fefegop.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a00a1f3596a---98854442300.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6132994d007274e08c16ab5c7ce1233/jowuloweturagotizexosu.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/wamixosabilo.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a9c263b9b---58169423828.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/zedabiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=chemical+kinetics+and+equilibrium+pdfPDF 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_off0000c56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56E 11272 bytes
SHA-256: 9a7b3559cd49e0f71fc718f8000323704d059ed0d8ea9dbc7c1b2adbd81d8522
font_01_sfnt_off0000df3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3E 16752 bytes
SHA-256: d8229a186a0b5cc857ce754cdd299827391747205cfe045d44858357984fbd32
font_02_sfnt_off00010a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1