Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1ec333a4fdb73b…

MALICIOUS

PDF

104.3 KB Created: 2021-07-04 12:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4924952cc39c5c5fcbd08bb14589f207 SHA-1: cadd77530f373dcad87fb781bf566d7f677e2227 SHA-256: 2c1ec333a4fdb73be79357c4c35e91c13582cbecc7cb966cbe1b362337f324a4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. The document body was unreadable, but the presence of numerous URLs hosted on potentially compromised sites strongly supports a malicious link-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb00b889a29---lidarokuwipazukovu.pdf In PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc791f7f5---bokiviwujajifegitilod.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/liloteponanefemin.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/bb5ab88e9896a64c8037090ef18db3e6/34792252889.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/475622afd97f709bb4e520dc7f964b2e/89294674869.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3958eb373---wimenazuwivabusu.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/d8a697302f544c27d35e408d64a3f5cc/72226278577.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5655adf385---robubevefixadimanerodiga.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/50d48c6344eda1430da912dac3ec807e/movapewusurazab.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b080aac677c90c83de2717d8a583c067/19984929030.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/27035811501.pdfIn PDF document text
    • https://invest.pl/userfiles/file/godofiwevuget.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609306cab35c7---96986559504.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6df574e77---lozapaxizuraroseru.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/99732342510.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/f877b273ae84b9c27fb07b70c485bcac/20404888703.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/kezosamegonuviwap.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/74081379573.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/mh4daomabv13trnjuql7usr8r2/jifupokobofunew.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f30088da---mevobeminodub.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/896fb28f5f0bf69631a884907ddb1d46/77116885942.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/betiguzigagamanulapuwapad.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a2901eb8d8a---sajebupusumibol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=mention+not+bengali+meaningPDF 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_off0001223e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223E 20524 bytes
SHA-256: 3cb9acc92b77a133b573dd6956232460a988580246437ad3049646280c32eb4a
font_01_sfnt_off000154a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A4 3108 bytes
SHA-256: 85f881f449b3eafdd514f3a8eeaa87bba75b65dcc3af5c8c78efc92695e55f34
font_02_sfnt_off0001616f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1616F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17986 10316 bytes
SHA-256: 74ef6b2f39ea105bb272bf6fd14b5be3c6ed87bb99cb111b856e6babf9dc06fc

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