Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee558da9c815441c…

MALICIOUS

PDF

105.2 KB Created: 2021-06-28 11:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7a397563ec7f5325d50b0372a4a760b5 SHA-1: 5972eb9df754558dfdeebf27ac5a9987d690d8c0 SHA-256: ee558da9c815441c82f3e5edd28dfd3708399e17ff708bce45e44f8e00c0b22b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • 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.
  • 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.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aaade2d9191---tevogunewalel.pdf In PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99af2b893e---jisemuxuloxanibevavav.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160725be3b392f---moluketinekevejuje.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/d2b2f4625e8f2b8dea19399a99d1e545/wosotefegukanazimivijed.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ebe68019d947e4507d76b40ee4ab88e1/40383628152.pdfIn PDF document text
    • http://jarosi.hu/files/file/fofixigasobax.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/donud.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74cd0586c4---80710027235.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/a2d4872fadbe70b0e8ea4eb08d62c597/bupizagibeginatelad.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/97582963790.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/vasikomub.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/vewipifemurebaberuj.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b49c4eac9fd0eea114602acea5ac4c0a/95025138338.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726aa8cd0d9---78332939443.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071e770a1197---44418987192.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1083df273f---depuw.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/m8sur4bab7f902tk5cuma44fc7/wuxekafolozezaj.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddeaa580c1---gozezet.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/5467f7c2bb16df49fb0da98f63ff5b74/jekoz.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947c2eee380---93269331183.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/86179432907.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/nibodoladojobedisut.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/giligonupukajugunetesas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cousin+meaning+teluguPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13173 19832 bytes
SHA-256: cd3c820c5f6231e897659e01b7a01a51b4f9c701861766906c304cd071276d16
font_02_sfnt_off0001649a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1649A 17100 bytes
SHA-256: f3277ac0d422d4e1868ac0340ecc4a6d0e664ad895240f6c2459a4b57f00499b
font_03_sfnt_off00017dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DDE 10484 bytes
SHA-256: 378d54c63008ca8edb43dc564a3cff465f4dae9b22da8d6d213c6af1d1635eaf

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