Malicious PDF — malware analysis report

Static analysis result for SHA-256 12362ee81a14f536…

MALICIOUS

PDF

84.7 KB Created: 2021-06-28 12:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 53a79e4c8b84661ceccec24daabce69c SHA-1: cc70747121168a21945783a29a346d87b1f2577b SHA-256: 12362ee81a14f536e71e7a6221ce0bf20270c51fc2693c7055f988afe02ea56e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm hosted on compromised CMS uploads and disposable domains, suggesting it's designed to redirect users to malicious content. The presence of numerous URLs, many pointing to compromised WordPress sites, reinforces the attack pattern of directing users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cuatro-pr.org/sites/default/files/file/jurenuke.pdf In PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871e73d1a16---gifupoj.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/e1glo0opbdn3jlevmjj8daf7c1/gesoninurenojikurijetoxoj.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c05d6eb993a---xevexajipupagameloloboxor.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ad8300174---burapudelorej.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/691vp06sjk0160st7l90u1v8jj/kegoxosopunaguv.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a97738aff71---xakobexexaxuzetejuxaditid.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/zusefexon.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d350451c7761b9b8ed0c79a22fcdd44a/vidaronikebapaluzopase.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/54859709777.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-30/20210430002048984086.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/iuecta5ucso2ht0tft1u2uacv6/69061053908.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/4afa5d17c83c9aeb0cb5f5cccf6f592a/zapunizupotozusazanokozik.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/13661484683.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fde97be15---lewoxidireb.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/punalopiguxidud.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607649a85ef29---12601987478.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4450222cd---gebofefos.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/efdf406e2b4ac20e5d35a11dcc5af272/terixoz.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/91105147512.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c24390cb1---valafudelawapaxop.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d2e51d421cdc2f3068f194bd3c20b333/zifatugetin.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/49595827708.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f115128a14---gavoxixofurekalozejavedep.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16072b0544e18b---89709354613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=decomposition+reaction+in+our+bodyPDF 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_off0000e9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 16416 bytes
SHA-256: 4ad1c6b8c7aba0897f5f7cfc6573026aea13d5077f03265dcdc3d90293f5f8cd
font_01_sfnt_off00011402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C19 10984 bytes
SHA-256: e9aa745a47bcad46f445f75fa4aaf9203618d72b2b495176d8de102151c96c3a

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