Malicious PDF — malware analysis report

Static analysis result for SHA-256 0159d5e0bc73790f…

MALICIOUS

PDF

85.0 KB Created: 2021-07-02 00:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dee4a082c8c04803be1fb61a66596c00 SHA-1: d603ae3ff080430ea4665ac7bb60e8d7bb6c7f9c SHA-256: 0159d5e0bc73790f19657536fe00c88f5809355568f4904a59a6e242c250278d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which point to compromised WordPress upload directories, suggesting a link farm used for distributing further malicious content or phishing. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, further supports the malicious nature by potentially executing malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • 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://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1f850e962---nebugokagagatikodajanira.pdf In PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/8e9d2f002cef5412cea693babe363a09/retamiwimuxepavimovol.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5263308b80---73976845049.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/9620840088.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/pegomuzorubixudutem.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/napodupewodesifasiratiwer.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/5a9270a2c870d4a123bbe38a8db65d42/dewolubotorofared.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/pidomomakanav.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076780dcb8ca---81162015820.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ii637o5i6bmj4df5jne8ok3o24/mixozalukufaz.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/75129693593.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/ziragoje.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/norevusisizedaza.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/70928301380.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/wifewelaz.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/da438a6cc80f0f1a54b41084945e7097/koxadamoluz.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/dpicdcahiho1gsu91f9j45kgqg/wepomutureseta.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/namibulejuduradem.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16090bf9550693---18941113413.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ec0ba56a6---96444034539.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/968842906d80caad2a5c38ff7483ac1b/72730583003.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/69d3f0c7965e0e18ce7eb1e56c037965/mozajikozimasojesal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=digestion+of+waterPDF 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_off0000e9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 17248 bytes
SHA-256: 29c3d10aa18ded5262cdb39d610fa39bd3b4b8cd164ce004817eb9a35d95043f
font_01_sfnt_off00011712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11712 10432 bytes
SHA-256: 91209456da22e6a163f0b6051d21eeac7a5a2a591284124b32d7a43b55fe3137
font_02_sfnt_off00012ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1