Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efda95a7bb05c80…

MALICIOUS

PDF

87.4 KB Created: 2021-07-01 22:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9c50be8ce87178ea01565df9e943ffcb SHA-1: 13115d4a48c3ad34222005570fded96cfb3a1240 SHA-256: 3efda95a7bb05c8042cfc47f33f304283f6c49c56288b7511b5ea61c70938d03
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple websites hosted on compromised CMS upload storage. The URLs are designed to appear as legitimate file uploads within form plugins, likely to disguise malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a1716ff0f---27855210448.pdf In PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/bc99896a21bbe4d699470c0f9954a8bb/voforefuwatupojibidedezap.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085ca63b3823---vekovopuwavisopur.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073131140899---riwizokofa.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/39187011670.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/35170525611.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/470fb8b28a32316e82af33edcd5e5b10/rizafugowaloxelo.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/54759307942.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e166b091f1---pesopife.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/98d10101512f912a194c16570ad3d7dd/61274638498.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160835939ba6dd---xexujerininulu.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/42131615144.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/421346fa61059506a218db562015f06b/jipojegotudajuleboma.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/30de5a3ec501781a3a5a2df01ab14860/42808741854.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/6222889967.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/tuwanawamiruvomitibi.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86247d24d9---sibuwodepagikigubomumer.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/75892610638.pdfIn PDF document text
    • http://artospace.com/pics/file/xesibaberuxajotomotoluwe.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/wekatu.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1fa167d2b---17916577343.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/fld53cacrqp1ou1m7ubc70jaag/kabejosexotur.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/juwagesuzeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+wrong+enemy+pdfPDF 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_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A2 18120 bytes
SHA-256: dccbf6a5521d04244b99a049f73baa60a38f001e7d0ae957bfb8ab570eeaa92a
font_02_sfnt_off00013783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13783 10540 bytes
SHA-256: 4e1925eacf3c27ca6d7b417a47c8a6f6eac7a324bafaaa9c833724429f920115