Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a71276763bdd3b…

MALICIOUS

PDF

70.7 KB Created: 2021-09-04 16:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e4730482b8b5f30468f5d92b0d422f05 SHA-1: d9ed6f3084b7643117c20b62a0a613bdea995369 SHA-256: e9a71276763bdd3bb43298b11d894fbdd69a6a3294b8c1054fee6ee7a4078464
176 Risk Score

Malware Insights

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

This PDF is identified as a phishing lure due to its image-only nature and the presence of numerous links pointing to compromised CMS uploads and disposable hosting. The document's structure and the embedded URLs suggest an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://aroma-es.red/yamituki-n/uploads/files/pivumesojogatadosojos.pdf In PDF document text
    • https://mediaskills.rs//files/zamafodafapejurixetexi.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/jovexakatales.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/f260b289c844c5f79127e3c59fd635b3/binuponitinutimasubobiw.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/15c77b34632d9bc3440559f9e80e6770/bogipigurolofovapejelad.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/55239275528.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a57be0c8009---nusigofiwotosiroxixawed.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/getomer.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/91518169777.pdfIn PDF document text
    • http://sdes.in/uploads/jazejirefesodezabuzogubuf.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/1a791e77f32749eedc1bc9a51ab7aed0/64534256226.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aff6c3df78c---40941292093.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/c7eo0khr6nkc4658ovhfooo0rc/zulirimomebuloxe.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/nepugu.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/teposugufusebata.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4tpcgifh8s9i5189it1fcviv75/35637973952.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/fumimawaw.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/badubomubuzukifumuj.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b690288baa---nipebetijekowujonexaseb.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/24032531490.pdfIn PDF document text
    • http://ave-france.com/pics/files/runuberonamev.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/wunafinitoxix.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/96537369269.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/visabafugedenerewokexa.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108422d9e02a---16190264158.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6564b5df6622c7dbf0cb3d59f4aeb675/tafop.pdfIn PDF document text
    • http://olympusflights.com/files/files/37020195689.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/uiun6hhsub8r15thnuqq7aqeg7/85962938509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=butterfly+printable+kindergarten+worksheetsPDF 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_off0000b6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CE 11364 bytes
SHA-256: d9b5cc460e972ace06dd1195b75d058a28a64af76ebdfc137dba95f37a8135dc
font_01_sfnt_off0000d128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93A 14508 bytes
SHA-256: 49fbb23fd5c54cde7405122aa67b1e10e1d39a31574a62031b206c089698f877

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