Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18d95398b02fcda…

MALICIOUS

PDF

75.6 KB Created: 2021-08-17 03:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 81c5f08d6e70e0c160a57e4acfdcc3d3 SHA-1: 023a303c15b4c9981a77473b0c61f6230c72689e SHA-256: e18d95398b02fcda829a0c64550557e914c655b3167f1d1b4fdb9c94981bfeb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs and link farms pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crysiq.ru/uplcv?utm_term=manual+de+operaciones+rpas PDF link annotation
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/839c5ff02acd2f4a2b54c171c7eacf98/jerorebimuzopevigigafo.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2e20e6dcc---31611033785.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/d65a9ba41af610813400b331dd0464ac/421002356.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/40823068790.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ifmbv9b6j5ckuoautvqdocjgm6/25884111976.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160b405bc6676a---mebob.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d7b810fa8---wepositogepupimebubem.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb79ded6df---85253687558.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/16515638044.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/pubagedoponaverinasimo.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/apucuip3uglf93vatd7rir1bp5/bogamitabat.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/guxutubadix.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/1c1f402fdfbddd81e8c88eb4f422b7a5/pelaporibup.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/38286647420.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/nowinu.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c8c3eb6e2---66725927038.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/49854619698.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/236165c20ce533ed682beff3de7ca14c/momigenolezedoduf.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/zaxiwaji.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/9396e6b0ed724bae458f6bab63b8a6c3/pubozugubegegafi.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2106200936314442015vbhb1.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/nurapiwisezab.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a09a25b2ae4---luvufisinixurubaseriwev.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ju6iurn6qh03f6qhjh8tnop8nc/gejivufojuk.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/53297743320.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/ffcc5ffb66d360906c6d4a1528f9ebe3/fepaki.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/7395685f5e3056a08807484e7262d3e8/31030838704.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_off0000c6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDF 16464 bytes
SHA-256: 3ea780399f214d38224af8f335ba356f3ccb5db152ec09ad84c535f049c4be5f
font_02_sfnt_off0001084f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084F 10500 bytes
SHA-256: d3a9d940fbf1c7a5cb14ccd1c376c3ceda09239416ca00c75548822187edcac8

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