Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d53ffb8b8d3440…

MALICIOUS

PDF

87.3 KB Created: 2021-07-18 00:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4fe4c0b5bd77224096d10c2f3a66edbe SHA-1: 3307975f4d4ed175136e94779580d67a034efa6c SHA-256: c4d53ffb8b8d344019d7b6cc70bf24619359a077664f1064aa663a922549678d
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. This behavior is indicative of a link farm used to distribute malicious content or conduct phishing attacks. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/c250ead3a6f75a9a02d4e4dfff54ae88/91820086874.pdf In PDF document text
    • http://www.tobywells.org/media/fckdir/file/30344621518.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ffde139a3---71635584886.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e86f6a3d70---jalumufiwenujamubadolema.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/desifo.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/nuxeboxot.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/8468784021.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/fiwurudefop.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/95983427148.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/7b0f37a789d9e766fdb62d97862ed0c6/judoloxolipugibekukavek.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/377055842.pdfIn PDF document text
    • https://binhvi.com/upload/files/fedif.pdfIn PDF document text
    • http://cucthongke.vn/userfiles/file///91441613448.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/20874907824.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/722fe86c2cfb5789008c2167660514d7/68524414611.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5b585124cfb12d31fe9e819343384015/90490837634.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/57851273774.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a96dfb6c5b9---82379523416.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/87dea89807cfbcb4351ac05d7e231ab2/55950048157.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/5cc560665c28e14ab9681a0749f920d6/zizujolabuwimir.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/23812284631.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/bebelupuzuvakesawomiforot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=cs+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C27 10556 bytes
SHA-256: 8def485d456d65e2ab9ed0b2bcc3fd8e4653107eab5977083f304182caeeaaf3
font_02_sfnt_off00012440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 16884 bytes
SHA-256: d24d4bc89ec47a71a5f61c4c26b83eda4e1abf646cca9f6c509218b374454ba3

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