Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc13d6547c3c8b6…

MALICIOUS

PDF

102.1 KB Created: 2021-07-17 02:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3db9219e85533a85a2ca210664493e10 SHA-1: d5fd2bb9df204362a0f8d104c64a58459eea5160 SHA-256: 7fc13d6547c3c8b698a817385a6bbbc70eead6dcc85b3faf75d544e947f5a05d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised websites, many of which host other PDFs. This suggests a link farm designed to distribute malicious content, likely for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent, and the embedded URLs point to compromised CMS uploads, reinforcing the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9358

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://audit-advisers.com/userfiles/file/zivudujimidafusufisuduw.pdf In PDF document text
    • https://okinawa4d.com/contents//files/latemiwolebusopiwe.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/057012c87af9bc4d3649149db5e42c9b/52235131840.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/0d7859b8e11315c022d838114f2b84eb/saguvakuxa.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16086ccea9824a---tebixexonudeb.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/ab3780e024bc21f63131efc93d681480/bilamivon.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/lolumomafilurutazulipan.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4aaf01a0bf48797a05079795e5c37007/58886755214.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ab523b26ea80aeb1500f2b83570b7e73/62467086546.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/2a381dafc83def8145a9a77e5bf97a20/namizoxijisurevas.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/18737941718.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/xuzubejo.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac43b78437---89054860650.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/b1t1b06utjkqiovk21dh2fvf97/tavaz.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/ferox.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98765527ee---57942260887.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/zesozogikibixiravigo.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vdvb95hb2tcmp3brcs59m33mc3/36136948585.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/326978cbd6550cfa4c8efe5e04eef8fe/85443777909.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71febcb488---15427057635.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/78095546827.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9c43624b2---furafokajavowe.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b294c5e21a4---29061298668.pdfIn PDF document text
    • http://tms-operation.com/upload/files/mopina.pdfIn PDF document text
    • http://belhavenhighschoolalumni.com/clients/13962/File/24716315932.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714be71071e---14908234022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=fated+to+love+you+sub+indoPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off000161ed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x161ED 22660 bytes
SHA-256: edbd64f58da38133465bb17e5cdac5e85743463f1a810ec908bf969d84717a5f
font_00_sfnt_off0000f727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 2432 bytes
SHA-256: bac84a99e850b4bc374d27aafd8b04cae62e33d8a14c109ab02a1409612192a5
font_01_sfnt_off000101b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B1 18352 bytes
SHA-256: 87c10ef92d15bee2ec2259b6a9d946db79fab845bb0a6b90de486aedf4490dd9
font_02_sfnt_off000131b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000149cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149CC 10540 bytes
SHA-256: 9e508fbbbe396f0f319f800c1cf67995f705d662648cbd02504a8b9b70b195cc

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