Malicious PDF — malware analysis report

Static analysis result for SHA-256 748fdc40f1100c80…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 22:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 91dadccdbe2f4716db07849bff6a54c6 SHA-1: 6006775ccc77b677b72368ed5aa7578113e5bf49 SHA-256: 748fdc40f1100c8034d5def42adc32eda1d0435c85b48466a78d52e55aa59cb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting malicious PDFs. The presence of external URIs and the nature of the link farm suggest an attempt to lure users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e98cd782c---sezovilifejitawopenuzawe.pdf In PDF document text
    • https://expomediainc.com/upload/file/17342832198.pdfIn PDF document text
    • https://superchills.com/userfiles/file/41460731907.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e6906e5c2---fivudigigikubegexulufin.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/75798980539.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210602110415.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/vipisulerefixep.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/xekokanalerenekaxizimewun.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/33049289599.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/41840548464.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/o2b4uapoenn8dk1hqk0ek4uo3m/wofawal.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/47238074373.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021062805594780.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/36d51959ce25ec623ff38fa13b0bd917/62776279579.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/1d9fedc8bbdf2374dc428d85a7f90558/38952992935.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/22287949806.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/pagamawidituvufewakeboxi.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092885108a66---xozeg.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/8f071c67af174d3c9ee4e11d13ad0678/84419592524.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/45515150100.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f220b7200---fibomivumekakogodiropodeb.pdfIn PDF document text
    • http://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/53102583009.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/58493428127.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/acbd1a9df30e8747972c7ee6157bae5e/wibefixezosuk.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2986a04dd0---89927296720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+hee+haw+gospel+quartet+the+old+country+churchPDF 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_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 11112 bytes
SHA-256: 9e75b8eaff6c437f282be2d99cfcde4c44c5b3d7b7b9a1899c8b19c864aff1e2
font_01_sfnt_off0000f1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BB 17404 bytes
SHA-256: 1e25c2e242cbdb86c552da3424cbaee6540d43d2e3245006606c755cef0dfbed

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