Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed021f7e8f0b9cbe…

MALICIOUS

PDF

90.6 KB Created: 2021-08-14 17:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 176c2f30289b4f755d7592dada5f79b5 SHA-1: 86bb39e060a0d97bb4df680878690363c34f7def SHA-256: ed021f7e8f0b9cbe3d7c29c72ef1a0cc2498a85a47b0eca2a3b3f51734fed46d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics suggest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://isystemlab.com/admin/ckfinder/userfiles/files/nifowapawudufe.pdf In PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092bf9acc1d9---77085456282.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d900b0f1bb---vuzutelipodon.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ee52f30ea---masakasonibemimeruka.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/93472353539.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1de85ba01d---82530490886.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/61ef460a9d9bf4d6507b71c2d47186d2/dowabamajipixavamupadopom.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffb0d259c6---fazof.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/8fga1hsnn5clc3e0li70mikq16/89319405399.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210708_D8CE8A648E9A7F36.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/nanon.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/012115331b16a179c95340dec2e9ce2c/sovetipodakomitapubawot.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3eaddf3724aa8bfaa4eb296782be6399/xosap.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3d5b2895a---37077957923.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/e7ad9f690d05db3adb07bdefb32ce43e/81836761164.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/46755261001.pdfIn PDF document text
    • http://askort.pl/Upload/file/diwikumefob.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/a78aedbb5ab266d9f33b610c7aa3f142/65413501057.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/tefujawevamal.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/14292070465.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/vegufamupelajibix.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/vg910fd91du7vcm50lgvrhbkuh/39512890991.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfeafc5c1a1---12508811807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+shut+off+a+rainbird+5000+sprinkler+headPDF 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_off0000fb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB54 11260 bytes
SHA-256: 14a6cf49a4fe981ea8c512278a227e2d38b78a1b5cf7d9c430bc9db117d686c7
font_01_sfnt_off00011580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11580 17800 bytes
SHA-256: 43fe7b8713506af21916d410ba576af144fe74b69d4373c30d1026a709481ec8
font_02_sfnt_off00014478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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