Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab02f2d1fd37a163…

MALICIOUS

PDF

130.4 KB Created: 2021-08-14 23:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c38afcd5fc9970d79085fff3b42d3dbc SHA-1: f72ace6f823088d6a6f3db46eed9076325429cb4 SHA-256: ab02f2d1fd37a1635002a8dd653d3028d688cabf7da14b55fc6f192b36e3176f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Numerous embedded URLs were found, many pointing to compromised WordPress sites hosting PDF files, suggesting a link farm or phishing campaign. The document body was unreadable, but the heuristics strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/a9b52f616767cf4e32ff29bfadab8e75/gesaruj.pdf In PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd4e687190---puwofonigogane.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2060cb1f5---powexaze.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/f33cec382bb94f71822632cd0c988f8d/niwupemeg.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2c20a0f4c---mumusawujisatakajodokik.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/tbd01r96klhu1vks8tjsug20ch/xilanimevobatularaj.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/gtfcjsveql0hr18qj9krhuce5a/tudopedinewurupus.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/98414995716.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c638293cd11---29649296186.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d8113bd83b983f9d0f65211ca416b0a9/60998102300.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/49595407724.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/tipowepazimisijuta.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/sfcta2rp8lqnnui2md2t231jb3/gowomigumezute.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/lilogejuminuxedokafimi.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/lipijug.pdfIn PDF document text
    • https://kawanmto.com/contents//files/36979858497.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0148c1d448---jewovufabapenelolas.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/5nag5qvk99q057bharb89isqs1/9493272665.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/kjpi042u9jd8fss8cevhih6e87/nowezelabizut.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bb35a3ac1---lojakejara.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/10005351475.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160813fa5211f0---betidovabu.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/11742422073.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/segifinesobitumofiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+american+experience+scottsboro+an+american+tragedy+pbs+worksheet+answersPDF 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_off00019be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BE2 11412 bytes
SHA-256: 3cf1bd094190ba68037cb098a21ee08fa1b27e38529003bc921c6fb18819e7b7
font_01_sfnt_off0001b64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B64A 16800 bytes
SHA-256: d84d690a417843acd5a0c09d5fc3953d8a86a3d9b416adb4a9a2fc227fbc7ab9
font_02_sfnt_off0001e206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1