Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28ff323da7e942b…

MALICIOUS

PDF

72.7 KB Created: 2021-07-24 19:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5b49e31fbd26cbafd4fa6d1eec7b1519 SHA-1: 41add21a347317f41b4fe172fb55b8195623c100 SHA-256: e28ff323da7e942b014c2fef6e674570bebd63ac3704e99fd8891159f0a3d88f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. While no scripts were explicitly extracted, the nature of the link farm and the detection names imply an intent to lure users into a malicious download or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e955e8cf0eaf1c657a1396d145b0723a/16128009635.pdf In PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/pt8br6lhutgc1omnm2o22peen2/92013830965.pdfIn PDF document text
    • http://abnicum.com/files/file/62742563744.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706b3f994f3---pudator.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/1744966454.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jrn3trq1f6tfsdobtd1snct7sj/xopena.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/26pcc0j6dvhhgnlt0105sfgqg7/34431934345.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/nuwezivedena.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a92ec17a226---jijufulaxex.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/57d98fc61a9e05afe4dd1fa6e5d55364/malab.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/vopote.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/74498730727.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/lubemisubomekakakovozumo.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16089b138dd642---gixijepenekomipemusixiwub.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b46e841a0d2---18674049791.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/69600499359.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/lumotevewilexo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d21c112fa8---gidilexa.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/828bbd8aec87975af65b9ef237793ee8/59526469622.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2361eba12099a1dd351c65bd1acf00ac/56638412258.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804d7470991---jebom.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3faf161f9---18556960175.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/3b24c4ec358a1c110db53bbab942e5f2/rixulalaziwololudem.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/a34ab1ad145fbbf169e2c039dcdb9fda/1532211904.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/32971043284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=vw+golf+parts+manualPDF 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_off0000bd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD05 15452 bytes
SHA-256: 1345464ecf5ffb68606fcf424abf2ba77ba962da4c0a8ad99eceb555cfb4eda3
font_01_sfnt_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 10632 bytes
SHA-256: cfd806b689bcaa17a9d714aef7a65aa59522c43f8ca9ef2cc8e210fcb633b094