Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be299c05e3df2d4…

MALICIOUS

PDF

82.4 KB Created: 2021-07-07 18:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ab9d182fb1a7ec3607b1b86352934c80 SHA-1: b8095fd97d40a41e30dc733be452019f8f9f8ea1 SHA-256: 3be299c05e3df2d4a7174a3b2548595c543147e42a3a9d5fcb1b05ab55438593
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to PDF files hosted on compromised WordPress sites. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to host these malicious links.

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 https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c65bb8860---luxiripekowotoros.pdf In PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f79d42102c---fojop.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/65e18c71aaecbafb333ebd3f9b090195/bidugopixoxaxigon.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/sapaxigan.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/flq6v91brdvrt16roi6lvrl7l3/zagezalunore.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730803ecc71---52020253019.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d8ae92de0---17792069870.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/d6ca699878c76a009552c5dba194cdd4/tezedavetanevikisi.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607115cc921b2---wijefekitexumarasanesibid.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c252ba9dade---82302769777.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/dqvscocasuoh1vs5rvnc63svtr/91402764122.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/sinex.pdfIn PDF document text
    • http://fygl.net/uploads/file/192125304759.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/q54e8krufo0e83hvjcekhl8m10/natowotima.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608a452557118---munuximabajawo.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160991ec83d434---83630982482.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/86091293952.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/k1j414g2cak3qr57udngs18cpd/jajizujumapetufemudu.pdfIn PDF document text
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/naram.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/78215983256.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081825a5936b---rekewekanutilawasefaki.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/vevizaginedevesekolek.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/96383445825.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/227f448db420163d014ac2d467c0c0b6/gutuloboxamewibubukafo.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ff57a3c952b0da2b6e28145fdd55c202/29319412521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=static+inline+variable+c%2B%2BPDF 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_off0000e333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 16160 bytes
SHA-256: 0e651575eb3e17c83515e2928e6f280b4cb4f90e4f7e6d2e96b9f470bcc0708e
font_02_sfnt_off00012515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12515 10216 bytes
SHA-256: d89587a7ce8fe7a627b81b22a808b9dc6fa4ac44ded6a3160fafb8852a2941dd