Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b11528f0e77e5d2…

MALICIOUS

PDF

124.8 KB Created: 2021-08-04 05:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: aee7673c81f8062038ae82e5988a93d0 SHA-1: 5ed492ea90079e1cd810e344a6070c9e8ee4046b SHA-256: 4b11528f0e77e5d22b601dea37e0469609201ef3b0f32721f3e09d0805503971
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious. While no scripts were extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9859

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://accessiblevehicleservices.com/userfiles/file/85708401775.pdf In PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/56pudqf943krhvf87j2dg8e7o4/voruwez.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/kulovelonesopu.pdfIn PDF document text
    • http://naoshima-habitant.com/judekezekirazafupi.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607124b3833c9---38575994085.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/4802623503.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/62089831832.pdfIn PDF document text
    • http://rideco.hu/upload/file/wegisevujoge.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c00cc87b9a---nimapumexitegirove.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea0ec670b4---nuzigabapigigofogodedeli.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723ec873459---84314033165.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/19246786537.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/lijivibilutumowimofodet.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088bf669d0a8---temewininonijojezuvilot.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/71a372770072e0cb6697363051942ac8/jibivulubovus.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846df406f54---febaxad.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/400b204501dabc267bf3ce18486df137/4848544317.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/2126076541.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/966c689f7fb8305ea891ec950e76ea2b/79530641838.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/5v50ncq3auek5s10dv9e1af9mi/zixewarusonafimazumifu.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/vusivepokuriwe.pdfIn PDF document text
    • https://sitarasign.ir/data/file/dalelokuwegufafilup.pdfIn PDF document text
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/zujexo.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/kosagogupis.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161066030b1363---rizepivubuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=a+wrinkle+in+time+chapter+1+2+questions+and+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14725 11356 bytes
SHA-256: 11f329670f9b6ddd49972f35af0f593841d5613bbd9e300e08f124f2c3098866
font_01_sfnt_off000161a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000179b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179B9 9124 bytes
SHA-256: cb231e6f83e93dfd6b348d8e53a9527365fb53bf5bc1578820b99c20d68940c6
font_03_sfnt_off00018c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C96 22696 bytes
SHA-256: d00854ed546ec8fa1524a9761eb41069ffc90904808c1590585bce5f14961e3d
font_04_sfnt_off0001c90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C90F 16792 bytes
SHA-256: b8dabf086363efe92667a1545355e2a98fde8270dc0cd9b12e2cb709de9dfe3a

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