Malicious PDF — malware analysis report

Static analysis result for SHA-256 293fa9955d68060c…

MALICIOUS

PDF

119.1 KB Created: 2021-06-30 03:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b529f5e37b57a34578b689770aeca6c7 SHA-1: fedc5c8a132e28c508b8dd33ffecc0d35f207dac SHA-256: 293fa9955d68060cce0da0fda64806570f22a5f06fa930b19cd3ac075ae6c554
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or lead users to phishing pages. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fafaabe00---nibiwawumakozitononu.pdf In PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/11c2f5f8d54faa46ef872ce7c3f996af/zilinexakab.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/497f4d61c500dafe4a47d22b9794cd23/21953445766.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16088fd5daa250---2269562709.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c18c2867d---69353049320.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/bafimewunoxamanejupa.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/porakafonuwinagopu.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/de80aa9ccfc676dea29754aae00a540b/37768490900.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/8211746552.pdfIn PDF document text
    • https://ecoretras.com/file/miwuzelukaludavuzu.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/0eef73dc136c254072ce65d7902f1c8e/49589346379.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160953ccd838d8---80883963385.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b78badce75f---30989183985.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/97c9f037f9bb2dcf50ca3b407477742f/wuzosak.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/wutiwuduzaroreroboxel.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/slhbet5jjrmu10metfn9arcblp/vujabubimajomuzadexovo.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210620_161054.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/jadalutuvelunumitevudus.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/e4b049bec84c91d04272b25f8b0c2572/fimilanizevogo.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/3187358064.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/2ttlfl06eshpms18f649nv8td4/55685153332.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be7454e2323---ronafigabal.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/616ff12f668ed257e9f74daf641e6613/gazajelapowegapetewib.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/94215349073.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/699830d7e16a2e198b6734cc2f759ca0/sitowajosisoza.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ac840e3b4c0748d4aff5bb20409954e5/11378329568.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/d5ff1e9ec48d2fdffc213bffee1bd919/tisetakalopifavaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=online+application+of+certificate+of+good+conductPDF 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_off00017141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18953 16992 bytes
SHA-256: e80111161d0247fda0202ea339cce395bb1075a4eee729f122c730ffcc8c42b2
font_02_sfnt_off0001b5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5CB 10752 bytes
SHA-256: 57238892c2388cfb3cc310700d3dd47ff563bff9de160fb3dda0189d85ecd035