Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ff9664a06fc1c7…

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 08:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4907d1d64e60e65b39e8984b3bb59d0a SHA-1: 15892eeadd3f3f576b8f6a42da44abda49598ce9 SHA-256: d2ff9664a06fc1c76ae4b89a5b111cbae640e61b107bbd16a2aab06cc822f8f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on compromised CMS upload directories, suggests a link farm designed to redirect users to malicious content or download further payloads. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, likely to mask its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://nomylo.ru/uplcv?utm_term=page+break+in+html+to+pdf PDF link annotation
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efdd0048ff---48112912828.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/62801929285.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160718b16d9b06---jubeduviwitebakonuxofikiw.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f9bc6646e2b---kulanosulolotukavimevo.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/podogekavituwu.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c216cd42d---56075436066.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/38130817851.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/kinobu.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/nazovepifebu.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/977a6f114ff9dd50ba548e6b17335902/51165568335.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/23301296317.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070994a15c6a---67494591769.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/61221010971.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbe062d570---xelodok.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/86030004468.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e078bed50---maletibefafomanegarojez.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fad7164a0a---makovuwumisazidunutezituk.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b10e92855---lipezok.pdfIn PDF document text
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/40175594150.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f539b03cf0---nulogozazebulonor.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/35527742256.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/zowoguwaxuwotitude.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/wizifipejolovago.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/terapenufujetimolop.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/paxezokezodekum.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/tiridemeju.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_off0000ce64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 11008 bytes
SHA-256: ce7a0953f3fdddf00c3f8db77bafab6aec366de50748c515a55826510f95b948
font_02_sfnt_off0000ff5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5F 17364 bytes
SHA-256: 7af9227fd9aafdde6a65ff212d21c810fe65ab4f15c839a4115540fad47b2444

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